I have been trying to update my wifes computer via the Microsoft Update Site. It has always updated successfully in the past. However, it now always fails and the list of security updates is growing. I have listed the current updates that are selected after the system scan that fail each time I try. I even tried turning off my internet security to no avail. Her system is a Dell Inspiron 600m running XP Pro. Any ideas or help would be greatly appreciated.

List of updates that fail:
Update for Windows XP (KB900485)
Security Update for Windows XP (KB914389)
Security Update for Windows XP (KB917344)
Security Update for Windows XP (KB918439)
Security Update for Windows XP (KB913580)
Security Update for Windows XP (KB917953)
Security Update for Windows XP (KB911280)
Update for Windows XP (KB916595)
Security Update for Windows XP (KB914388)
Security Update for Windows XP (KB917159)
Security Update for Windows XP (KB921883)
Cumulative Security Update for Internet Explorer for Windows XP (KB918899)
Security Update for Windows XP (KB917422)
Security Update for Windows XP (KB920670)
Security Update for Windows XP (KB920683)
Security Update for Windows XP (KB921398)
Security Update for Windows XP (KB922616)
Security Update for Outlook Express for Windows XP (KB920214)