installed MS-Office XP SP2 and now cannot open Word or Excel files

Microsoft Office Word

After applying the MS-Office XP 2002 SP2 update I can no 
longer open Word or Excel files. In Word I receive the 
error "the specified file is not available or in 
Excel "unable to read file"
Disable the Office Plug-in in Norton Antivirus. See "OFF: Cannot Open Office
Documents or Cannot Edit Inserted Objects After You Install Office XP
Service Pack 2 or Office 2000 Service Pack 3" at