Re-installation question

[George Shaddock]

My system tells me that I'm missing files,(it doesn't tell
me which files are missing) and can't work with programs
already installed. I'd like to do a re-installation, but
do NOT want to re-format my hard drives. How do I go about
this???

 

[Dave Patrick]

Why not try from the "Run" box
sfc /scannow

Else

How to Perform an In-Place Upgrade of Windows 2000
http://support.microsoft.com/support/kb/articles/Q292/1/75.ASP

What an In-Place Windows 2000 Upgrade Changes and What It Does Not Change
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q306952