OLE error in Outlook 2000

I have a client whose Outlook malfunctioned after updating to IE6. When he clicks on Outlook now he gets "An OLE regristration error occurred. The program is not correctly installed. Run setup again for the program." I've tried the "fix" listed in the Technical Q & A, but still no banana. I've reloaded Office, reloaded W2k Pro, still nada. The client has (2) hard drives, 1 is ~2GB, other is ~4GB. 2GB has OS, 4GB has Office. I tried putting Office on same drive as OS, made no difference. Got a clue to help me out?