Lite-On Tech Support tells me that the reason my brand-new replacement DVD drive won't work in Win 7 Pro 64 bit and will work in XP Pro SP3 (on my dual boot system) is due to driver problems, not hardware problems. The drive takes about four minutes to recognize a self-booting installation disk and display the initial screen. That's as far as it goes. It spits out data or music disks with the message "Please insert disk in Drive G: Accessing Properties for the drive in Device Manager takes over a minute, with the Device Manager window graying out and displaying "Not Responding" at the top. I have tried removing the device and letting it reinstall without any success. Installation of Win7 was quirky. I was unaware that the 3-year-old processor in my custom-built system was 64 bit, so I installed the 32 bit version of Win7. A couple of days later I saw a message that some no-account piece of free software "Is not supported in 64 bit." When I checked System Properties I discovered that I have a 64 bit processor (!) and also, by some miracle, a 64 bit OS. Apparently Win7 morphed itself. Thinking cdrom.sys may be the 32 bit version and/or corrupted, I snagged the file from my husband's smoothly running 64 bit machine. However, I am not able to swap it in because I lack permissions. I can't use Device Manager to update to that file, because it will only recognize ini files. I can't use the installation disk because the drive doesn't work. I could try using another machine to copy the cab with that driver to a thumb drive if I knew where to look... Or maybe I could download it? When I try to let Windows update the driver, I get the message that I have the latest one. Any suggestions? I'd really like to get this sucker working!

A couple things to try.Try a "clean boot" and then try using the drive:http://support.microsoft.com/kb/929135Follow Step 1 to clean boot and Step 7 to return to a normal startup.Also, does the drive work OK in Windows 7's Safe Mode?Also, can you run the system file checker to check for system file corruption - follow Option 1 in the folliwng link:http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html

Hi grangeek,The 64-bit system won't change to 32-bit by itself unless you reinstall the OS. According to your old thread, I know you have got a new DVD drive, do you mean the this new DVD-ROM does not work? If so, is it compatible with Windows 7? Please let us know the detail model of your Lite-On DVD-ROM. If the new DVD drive is not compatible with 64-bit Windows 7, why not replace it with a compatible one. you can check it in the following link: http://www.microsoft.com/windows/compatibility/windows-7/en-us/default.aspxAt the same time, you can try the following steps to test:1. Test your DVDs in the safe mode.2. Restart your computer, and boot from the DVD to test if the Installation DVD can be recongized normally. In addition, you can try my suggestions in your old thread.I hope this can help you. John