Can anyone advise my why when Im offered the office update I get this error message:

Update for Microsoft Office 2010 (KB2553347) 32-Bit Edition - Error 0x80070643

Ive try looking into it and it seems I have SP1 Package, not 2, which I think is what Im supposed to have, so I downloaded it to then be told "Service Pack 2 for Office 2010 (KB2687455) 32-bit Edition" "The expected version of the product was not found on the system"

Can anyone advise - none techie explanation please