I resolved virus issues on a customer’s PC and installed SP2 on her 36-bit Vista Home Premium. Decided to upgrade my 64-bit Vista Ultimate and got errors. Had a 2-hr chat session with Microsoft—good support. Some corrupted files were found. A Service Pack2  download froze at 84% complete. Now, I have to do an “in-place-repair” called “an upgrade” for Windows Vista to see if that resolves the issue and then maybe download the SP2 file again. Isn’t computing fun???