It could as simple as this:
A corrupted user profile. It happens for reasons unknown.
I've had it happen several times. My solution-a system restore back to time just before the issue began.
You might want to try system restore before you do anything else.
Open up task manager. In Applications tab, click New Task.
Type in restore. The restore folder will open. Look for rstrui.
Click on it, system restore will open. Choose Restore my computer to an earlier time.
Select a date as close to just before the issue started, follow the prompts.
Your computer will reboot. If the restore is successful, your desktop should show up.
If you cannot access system restore using the above method, reboot your computer and start it in safe mode. Log on using the administrator account. From Start/All Programs/Accessories/System Tools. Choose System Restore.
After you get your desktop back, scan with your antivirus and malware scanners. It is possible that your problem is caused by an infection. You can also post about your issues in the Bleeping Computer Am I infected? What do I do?
forum. Include as many details about your problem as you can.
Someone will guide you through the process to find out if your system is infected and assist you in cleaning your computer if it is infected.
Edited by Queen-Evie, 12 December 2008 - 12:49 AM.