I get all the time that there is a file system error, and I have to run CHKDSK. However that doesn't work. I tried a lot of things, but itdoesn't work.When I get that massage, I can't copy/make filesfor about 10 minutes.How can I fix it (without install it again please?)

Why "without install"? I certainly hope you followed the best practice of never installing beta software on a production machine or on any machine you are unwilling to wipe and reinstall cleanly.If Chkdsk doesn't work, perhaps your hard drive is failing. Test it with a diagnostic utility downloaded from the drive mftr.'s website. You'll need to burn the .iso as an image, not as data. It's my understanding that Win7 now includes that ability. I haven't tried this yet, but have read that all you need to do is double-click on the .iso and you'll get a utility to burn the image. So boot with the media you just created and do a thorough test of the drive. If it fails any physical tests, the drive needs to be replaced.If the drive passes all physical tests, then I'm sorry but you should do a clean install of Win7. MS-MVP - Elephant Boy Computers - Don't Panic!

Malkeleah said: Why "without install"? I certainly hope you followed the best practice of never installing beta software on a production machine or on any machine you are unwilling to wipe and reinstall cleanly.If Chkdsk doesn't work, perhaps your hard drive is failing. Test it with a diagnostic utility downloaded from the drive mftr.'s website. You'll need to burn the .iso as an image, not as data. It's my understanding that Win7 now includes that ability. I haven't tried this yet, but have read that all you need to do is double-click on the .iso and you'll get a utility to burn the image. So boot with the media you just created and do a thorough test of the drive. If it fails any physical tests, the drive needs to be replaced.If the drive passes all physical tests, then I'm sorry but you should do a clean install of Win7. MS-MVP - Elephant Boy Computers - Don't Panic! OK thank you for the solution.I did not mean that I've installed it on a PC that I don't want to format, but Ijust don't like to do it. I don't have a lot of time (I've got some, but not loads of), that I want to use on testing Betas. The installation is mainly wainting to me, so therefore I don't like it so much.