This post provide technical support tips if you Unable to open Add/Remove Programs Tool in Windows 2000 This post provides step-by-step instructions for error while opening Add/ Remove Programe in Windows 2000.
To resolve this issue, add the missing registry entries:
Click Start -> Run.
Type regsvr32 mshtml.dll, and then press ENTER.
Click OK to confirm
Type regsvr32 shdocvw.dll -i, and then press ENTER.
Click OK to confirm
Type regsvr32 shell32.dll -i, and then press ENTER.
Click OK to confirm
Try to Open Add/Remove Programe