Quote The Elf:
A re-install would be a good investment of time at this point, but...
...image copy that system drive!!!!
The next time you have a system that has become questionable you have an image copy to revert to and none of that pain of re-installation!
I second that emotion - having a security copy of your entire WIndows setup all ready to restore if the worst happens is a lovely feeling.
If the worst does happen you can just smile in the face of adversity