I have been having a problem updating and for that matter unistalling my office xp small business program I try to do an automatic update it gets to around 40% then I recieve this message

Error! Unable to check for updates on this computer Help

The Office Update site is unable to check for updates on this computer. This may be happening because of one of the following reasons:

You do not have administrative privileges for this computer.
There is a network problem and the detection catalog used by the Office Update site failed to download. Go back to the Downloads home page and try running detection again.
Windows Installer patch files (.MSP files) from previously applied Office updates are missing from the \Windows\Installer hidden directory on your computer. MSP files are stored on your computer after update installation completes because they need to be referenced for future update operations. If the files are missing you will not be able to apply Office updates. You may also be unable to uninstall Office products as a result of the same problem. Please contact Microsoft Product Support Services for assistance.
You installed Office updates in the past and then upgraded from Windows Installer version 1.0 to Windows Installer version 1.1. For more information see the KB article Windows Installer May Prompt for Install Source if Unavailable.

this program came in a package deal from Dell I have tried pretty much everything execpt for foramtting I am at a loss of what else to do and I am not sure how long it has been like this because I never really updateid it that often I just wanted to remove a program off office but it would work so I went to update and well it didn't work either.
I can download any files but I cannot install them I also tryed t odo the email thing to micro soft but when it tried to detect my program wasn't detected . well I hope you people have some clues or help for me . I am not a total noob at this but there is allot that I don't know . so any help would be greatly appreciated