One solution
I was having this same problem with an XP-Pro SP2 machine. It all started at boot up this morning. Neither the user nor any other account on the computer including the administrators account had any desktop functions. Just wallpaper and mouse curser. Ctl-alr-del did not even invoke task manager. After a few hours I traced the problem to PC-Cillin Internet Security 2004. After disabling and uninstalling it the system worked fine. I was able to reinstall PC-Cillin and after all the updates it is working great. I have 4 other clones of this workstation running the same software, with the same settings, but have had just this one occurrence. It is obvious from all the research I did on line that there can be many cause’s for this behavior. I hope this is of help to some one out there.
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