How to fix Windows Registry Errors?

If it is still possible to boot into Windows your first step should be to do a full registry scan. You can download registry software here.

You cannot boot into Windows? Try if its possible to boot by using safe mode. While Windows is booting press the F8 key and select “safe mode”. After logging in scan you registry like mentioned before.

If you are able to do this install a registry repair software and try to fix you registry.

If you are not able to boot into safe mode you could also try to repair your windows by booting from the windows cd and choosing repair windows. This should be your last resort since after repairing windows you will have to reinstall all previously installed programs and windows updates.

http://support.microsoft.com/?scid=kb%3Ben-us%3B307545&x=14&y=10