This just happened to me.
SYMPTOMS
When you try to log on to Microsoft Windows XP Home Edition or Microsoft Windows XP Professional, you receive the following error message:
Windows cannot load your profile because it may be corrupted. You may be logged in using a temporary User Profile.
CAUSE
This issue may occur if the current user profile is damaged.
RESOLUTION
To resolve this issue, create a new user profile.
http://support.microsoft.com/kb/318011
So I have to create a new User Profile. According to this (and a lot of other sites I found) it is possible to do and to copy over data to the new profile.
How to copy data from a corrupted user profile to a new profile in Windows XP
http://support.microsoft.com/kb/811151/
It's not hard to do but not simple, either. Certainly more than I can deal with at 12:10 AM after a long day. Grrr.
I assume I also will have to reinstall programs if they are not global, and I will likely lose all my settings.
What I cannot find out anywhere is why this happens.



