You didn't mention what happens when you try but from the "Run" box
try; regsvr32 %windir%\system32\appwiz.cpl
regsvr32 %windir%\system32\webvw.dll
to rebuild several *.htt files
If unsuccessful try
sfc /purgecache
sfc /scannow
Or try the regedits described in;
Add/Remove Programs Tool Displays Installed Programs Incorrectly
http://support.microsoft.com/default.aspx?kbid=266668
----------------------------------------------------
If the problem persists, you'll likely need to perform an in-place
upgrade.
How to Perform an In-Place Upgrade of Windows 2000
http://support.microsoft.com/default.aspx?kbid=292175
What an In-Place Windows 2000 Upgrade Changes and What It Does Not
Change
http://support.microsoft.com/default.aspx?kbid=306952
Be sure to apply these to your repair install before connecting to any
network. Internet included. (sasser, msblast)
http://download.microsoft.com/download/E/6/A/E6A04295-D2A8-40D0-A0C5-24
1BFECD095E/W2KSP4_EN.EXE
http://www.microsoft.com/technet/security/bulletin/MS03-043.mspx
http://www.microsoft.com/technet/security/bulletin/MS03-049.mspx
Then
Rollup 1 for Microsoft Windows 2000 Service Pack 4
http://www.microsoft.com/downloads/details.aspx?amp;displaylang=en&fami
lyid=B54730CF-8850-4531-B52B-BF28B324C662&displaylang=en