I had a similar problem - Files/folders/sub folders appearing and pc would not shut down correctly. Always had same programme "not responding" in task list.
Cause was "spyware" . I used Lavasoft to identify and remove the offending items and all has been fine since.
Free Download from click here
Do you use a firewall ? if not suggest you get one of the free ones off the net as they help stop this stuff getting onto your pc.