Can I Repair Windows Errors Manually?
Well, there have been entire books written on the that very subject!
And the answer is probably yes in most instances, but repairing
windows errors can certainly be a long and tedious process,
especially for those who just want to get on with their business and
not have to get a degree in computer science just to use their
computer!
Sometimes your windows operating system will become so unusable and
badly damaged that you cannot ignore it, and have to take steps to
repair windows errors.
The computer registry (the place all data is stored that tells
windows how to run your programs) will sometimes get corrupted or
damaged, and the result is nice things like your computer freezing,
the "blue screen of death" appearing, etc., right in the middle of a
major report you happen to be working on!
Microsoft windows comes with a "repair option" on the installation
disk, but in the past when I have used or tried that feature, it took
so long or proved ineffective enough that I almost always ended up
just reinstalling the entire windows operating system...your second
and more permanent option....

Registry Repair: http://groups.yahoo.com/group/regrepairsbv