Windows 7 fails to go into safe mode. Stuck at classpnp.sys
Hi, I wanted to go into safe mode on windows 7 but it kept stopping at classpnp.sys . After reading a few threads I read about using Msconfig and checking the safe mode option under "Boot". It still keeps staying at classpnp.sys and when I hit F8 and hit "Last Known Good Configuration (advanced)" it seems to be able to get trough and it says it's actually loading up safe mode but then it changes to a black screen and does not change from that screen. I would appreciate and information you guys have that could solve this problem. If any of you know a command I could type in cmd to bring up the msconfig while in repair mode I could fix it because all I need to do is untick "Safe mode on startup"
March 9th, 2010 3:43am

Hello,Try the following resolution:1. Boot the computer to windows recovery mode.2. Click Commmad Prompt, type in:rename c:\windows\system32\drivers\classpnp.sys classpnp.oldNote: I assume that your windows is installed on C drive. I have tested this step, it will not crash your system.Thomas77
Free Windows Admin Tool Kit Click here and download it now
March 9th, 2010 11:48am

Hello @Thomas_77I have tried your resolution with no luck. I got the blue screen of death and then the computer reset it self back to c:\windows\system32\drivers\classpnp.sysI put my comp in safe mode to install the second disc of Fallout 3. I had to do this for vista. The problem was exactly the same then. I am now running windows 7 home premium 32bit. last time while on vista the computer fixed it self and after about an hour of looping loged on under safe mode. however this time this is not happening.I get from pushing the power button till a black screen with a cursor on it. Then it starts all over again. I'm not sure what else to do. I do not have install discs for either vista or windows 7. The shop in new zealand where i brought it from says we do not need them. Any suggestions.
March 9th, 2010 12:14pm

This happened to me because I tried to install Fallout 3 too. I tried doing the c:\windows\system32\drivers\classpnp.sys to classpnp.old but then it just stops at the one before and goes on to say windows is starting in safe mode but then it shuts off and restarts.
Free Windows Admin Tool Kit Click here and download it now
March 10th, 2010 2:25am

This happened to me because I tried to install Fallout 3 too. I tried doing the c:\windows\system32\drivers\classpnp.sys to classpnp.old but then it just stops at the one before and goes on to say windows is starting in safe mode but then it shuts off and restarts. Glad to hear tat Fallout 3 is still being played.Firstly there are a few things that I have discovered. Classpnp.sys causes a few problems with the system. As I don't know what your system or brand of computer you are using, I'm not sure exactly what advice to give. However it should work a little something like this. When you start your computer you will see the brand name of the company who built the system (ie. Acer, HP, Compaq etc) Press either alt + F10 or alt + F11. This will bring you to a recovery type menu. From here you can do a system restore you will loose any un-backed up data. This trick will restore your systems factory defaults systems. I have not been able to try this myself yet.Also depending on your what OS you are using you could try and and get a hold of either the Vista or Windows 7 recovery disks. You can download them from here: http://neosmart.net/blog/2008/windows-vista-recovery-disc-download/You will need a burning software as recovery disks need to be on disk so you can boot it up during windows start up.Use this software: ImgBurnhttp://www.imgburn.com/ Its free and is very effective (I can see this having more use with other iso files of mine) Again I have been unable to try this myself. And the last option short of formatting the drive is to use another piece of software called Ubuntu 9.10 Desktop.This is freeware that needs to be downloaded (http://www.ubuntu.com/) and then burnt on to a disk using the ImgBurn mentioned above. Put the disk into the drive and but it up during windows start up.You also need to download a replacement classpnp.sys file. You get this from http://www.hotfile123.com/index.php?q=classpnp+sys(I also haven't tested this file yet but there other options on the site)While using Ubuntu find the classpnp.sys (C:\windows\system32\drivers\classpnp.sys) rename this to classpnp.bakCopy the recently downloaded version of the classpnp.sys to replace the old one. Exit and restart. The computer may lag a bit but should eventually boot into safe mode. Sadly I haven't been able to try this yet either. Although none of this helps with getting fallout 3 to install any easier. I will post with my progress and with what works in the near future. Hope any else can do the same. Good luck.
March 10th, 2010 3:39am

I have sort of fixed the issue on my computer. For further information check my thread Windows 7 and the classpnp.sys safe mode loop. @ Erik Soto, I am still unsure on how to install Fallout 3 Game of the year edition with out going into safe mode for the second disc. As I had to go through all I did to get this far in fixing my computer I am unwilling to try it again until I have other methods.
Free Windows Admin Tool Kit Click here and download it now
March 10th, 2010 9:35am

I will try some of the things you said soon. My computer is a Gateway
March 12th, 2010 3:27am

Hello,Try a in-place upgrade to repair the corrupted files:In-place Upgrade============= 1. Insert the Windows 7 DVD in the computer's DVD drive. 2. Click Start and choose Computer.3. Please find the "setup.exe" file in the DVD-ROM and double click it.4. Click Install now. 5. When we are prompted to input the product key, please click Next without inputting any key. The setup wizard will prompt and ask if you agree to install Windows 7 without the key. Please choose to confirm.6. When you reach the "Which type of installation do you want" screen, click Upgrade to upgrade the system files of Windows Vista.Thomas77
Free Windows Admin Tool Kit Click here and download it now
March 15th, 2010 4:55am

I cant get past the safe mode boot up. And to Limbix, I tried the Ubuntu thing but it gets stuck at the white Ubuntu sign.
March 16th, 2010 7:31am

Besides above suggestions, please also try the following steps to troubleshoot the issue. 1. Temporarily disable all unnecessary hardware devices in Device Manager, such as Modem, sound card or external device. For detail steps, we can refer to the link below: Device Clean Boot 2. Run System File Checker (SFC) to verify whether any system file is corrupted. If the issue persists, I suggest you insert the Windows 7 installation disk and repair the system. Thanks, Novak
Free Windows Admin Tool Kit Click here and download it now
March 16th, 2010 11:44am

As stated before, I cant get past the Safe mode loop. It try's to go into safe mode and then crashes and restarts and then repeats. I'm thinking of just re-installing windows 7.
March 16th, 2010 11:22pm

My computer is a Gateway too. I started to have this problem after installing the Sniper Ghost Warrior game. After boot, system just stopped to boot in 'Windows is starting'. What I did: Into BIOS, reseted all configs to default. Than, reboot and, inside the BIOS (again), reset system to your old configs; Restart Windows and everything should work fine. (I had this idea when I read that this classpnp.sys was a hardware file);
Free Windows Admin Tool Kit Click here and download it now
June 30th, 2010 2:21am

I'm having some problems with my main HDD. HD Tune pro accuses it of having a very high spin number. I'm working on it;
June 30th, 2010 2:41am

Hello, A little late but I just wanted to point out that Limbix's solution worked for me. Now, I never created recovery disks. I have a Sony Vaio VGN-NS325J. My computer would just hang on the startup. Then I would get the blue screen of death. It will restart and then give me the option to repair or start normally. I would choose repair. Attempted restore. Initially it would work. But as days went by, it would not restore at all. It would just reboot continously. I tried booting in safe mode and the system would hang at the Classpnp.sys file. I applied the solution provided above to renaming the classpnp.sys with classpnpn.old. Restarted and then the system would hang at the strtup, a brief BLOD would show and the computer would restart. So the bad thing was that I never backed-up my data. So my going in was to try Limbix's solution on pressing Alt+F10. Low and behold, the reccovery screen showed up. I was able to see my C: drive. I backed-up my data. You can backup up to 21 CD/DVDs worth of data in one session. After four DVD worth of backed-up data, the computer restarted. I applied the Alt+F10 key again. This time, I chose restore computer to factory setting. WARNING: This will wipe out everything (formats the drive and restores computer to the same condition when you first purchased it). The computer restored back to the Old Vista Home premium (Originally it was bought with Vista with a free windows 7 upgrade sent later). I did this last night, and I am currently writing this post from the same laptop. Granted that I have to reinstall Windows 7 Upgarde along with the usual Antivirus, MS Office, copy personal files from the backed-up DVDs, etc, etc., I am a happy camper. Basically, I got my laptop back. I am still unsure what caused the problem. A friend of mine said that perhaps a windows update caused the crash. I do not know. A very good lesson has been learned. I will create recovery disks that Sony offers and put them away in case I run into a similar situation in the future. So thank you Limbix for the post. It helped me tremendously. B
Free Windows Admin Tool Kit Click here and download it now
October 26th, 2010 5:08pm

a late reply from me, but is migth be helpfull for people with the same problem as above. I got the classpnp problem but none of the solutions helped for me. A re-install was the only solution i could think of but even in a re-install the system hung during the installation. I begun to think what the problem could be and started to disconnect everything. At last i got to the harddrives and there was the problem, the cable was fine, but the d-drive (not the windows 7 drive) was not. After disconnecting it windows started and made me a very happy man.
April 12th, 2011 4:33pm

Try enter to BIOS and change the disk mode from AHCI to IDE, that works for me. My computer: Acer Aspire 5536 Athlon X2 64 Win7 32bits
Free Windows Admin Tool Kit Click here and download it now
May 21st, 2011 3:01pm

I am having the same issue. I have only had the laptop since January. It is the first time this happened. I updated Windows 7 and then it stopped. Everything I have been told hasn't worked. Trying the BIOS idea and then I'm stumped..
June 13th, 2011 7:01pm

This topic is archived. No further replies will be accepted.

Other recent topics Other recent topics