On a few occasions just recently my win 7 pro system has come out of "screen saver" with nothing but my desktop background displayed. If I then ctrl/alt/delete the screen goes black with just the cursor showing but otherwise unuseable. After a while the background will reappear but the only way that I can get the icons and everything back is to reboot.
I have done a very thorough search for malware but none found. The problem never occurs whilst I am actually using the system and it does not always happen when it has been left to go into screen saver.
Any one any ideas?

Moderator
CNET Staff
Samsung Staff
Dell Staff