Windows 7: Windows 7 registry/drivers problem

I wanted to clean my computer using some quite complex program with many functions as registry problem fixing and driver problem fixing. So I started a scan. Result was about 500 problems to fix. I decided to use backup option before choosing to fix. So after backup and fix, program demanded restart. All loading was fine but when came to load desktop, it did nothing. Just black screen with no response. So i restarted and used safe mode. It started to write out drivers and then it stopped on "classpnp.sys" and again jumped in black. Can anyone help how to restore system? Even tried Linux (SLAX) but even with some "Windows modification" program didn't run.

Try a Restore point, before your playing about.
System Restore
System Recovery Options



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Thanks for your reply.
I tried one restore point but no changes. Problem is I dont have recovery disk. None was there when i bought notebook. I read somewhere that Acer notebooks dont use recovery disk, but there is hidden part, that can be "somehow" used during computer start.

At the acer screen on bootup, press Alt-F10 (hold down both keys together). Then follow the prompts.

I chose option to find and fix problems during start-up. Now its about 7 hours and its still working with no sign of progress. Is that normal or should I try another way?