issues with uninstall/install on Windows 2000

Item Value
OS Name Microsoft Windows 2000 Professional
Version 5.0.2195 Service Pack 4 Build 2195
OS Manufacturer Microsoft Corporation
System Name F4H0U8
System Manufacturer D845HV
System Model HV84510A
System Type X86-based PC
Processor x86 Family 15 Model 1 Stepping 3 GenuineIntel ~1694 Mhz
BIOS Version 05/25/03
Windows Directory C:\WINDOWS
Locale United States
Time Zone Eastern Standard Time
Total Physical Memory 523,552 KB
Available Physical Memory 324,488 KB
Total Virtual Memory 1,800,408 KB
Available Virtual Memory 1,410,996 KB
Page File Space 1,276,856 KB

Windows Installer - comes back with this message below when I try to uninstall a program. The feature you are trying to use is on a CD-ROM or other removable disk that is not available.
OR this is another box- that comes up and states - enter an alternate path to a folder containing the installation package 'SGuard.msi' *****
I have taken the liberty of installing the utility tool from Microsoft "Windows Install Clean Up" which helped with removing a program. Is this a common problem with 2000. I just recently upgraded from 98SE so I am new to OS 2000.