solution that worked for me:
1. Start your Windows XP to Desktop.
2. Press Ctrl+Alt+Del key to open the Task Manager.
3. Click File menu and click "New Tasks (run...)"
4. Type iexplore.exe, and will open internet explorer browser
5. Type c:\, click "My computer", click Control Panel
6. Goto add remove programs, then removed the windows update file that
caused the problem before blank desktop occured. (also applicable to
remove the specific software that caused the problem- "blank desktop").
7. restart computer -OK, try it if it will solved your problem.
