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I have run into serious problems, my System32 files are corrupt and it cannot install new usb devices, I think it's a problem due to messing around with system files and settings. Is there anyway to factory restore the core files without affecting any installed program?

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So you want to reset the system, but not really? Have you tried system restore? – soandos Nov 30 '11 at 2:01
System restore doesn't have a distant-enough restore point. – Mob Nov 30 '11 at 2:06
Windows 7 doesn't have a Repair Install like XP, so I think you are out of luck. You can copy any files adn documents off of course, but you'll probabaly need to to a reinstall for everything else. – Paul Nov 30 '11 at 4:44

Open an elevated (running as administrator) command prompt and type sfc /scannow. This will repair all of the default Windows system files if they are corrupted.

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I already did that. – Mob Dec 1 '11 at 7:26
up vote 0 down vote accepted

I did a backup of my documents, factory-reset my OS with the backup provided by the system manufacturer, and then restored the backup.

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