Can’t install Norton Client on Win 2000

I have one computer that I upgraded from Windows 98 to 2000. Everything is done except I can not install my Symantec Antivirus Corporate Edition client. It brings up the Microsoft Installer box and says “preparing installation”, then stops. I have tried reinstalling the Microsoft Installer, and Service Pack 4. i have also called symantec who walked me through complete removal of previous version still, no install. Any ideas?