[SOLVED] Funny little black box appears suddenly?

a new small box is there... It looks like a dead pixel, but its a black box. I can drag it, but nothing else...
It can be anything - some malware, spy program, keylogger. Anything.

Go into Task Manager processes list, try to find and kill it.
In Task Manager startup list - try to find it and disable it.
Then find all references to it in registry and remove those references.
Be careful with registry. It's possible to do much harm in there, if you don't know, what you're doing.
 
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Did a full scan with antivirus, and they found nothing harmful.
I will try to see in the task manager, if I can locate what it is... Otherwise, I will reinstall windows to make sure i think.