cells.item(...) is null or not an object

[Guest Isak Badenhorst]

When I start Win XP SP2 I get to the welcome screen with no user names

displayed. I then press Alt+Ctrl+Del twice and type in the username and then

is able to login to Windows. When I go to user accounts in Control Panel I

get the error message cells.item(...) is null or not an object. When I go to

computer administration and then local users and groups there is no users

listed un der users but the groups is listed. I did a windows repair with no

luck. Please help?