On all user accounts, when I log in, the error below always pops up. There seems to be no problems with my computer since the error, but it started happening when I set up a guest account. Can anyone help me fix this, it rather ugly and annoying to face every time I log in. Thanks

I've give absorbation the solution over messenger, but for reference here's a link to the patch, http://support.microsoft.com/kb/935448. Its caused by one of the recent windows security updates.