I don't like the smell of this. It may well be some hacker letting you know he has found your documents.
Go run "msconfig". Go to the Startup tab, and uncheckmark everything except your Antivirus and Firewall. If there are hacking tools installed, then it has got to startup somewhere.
Go check Control Panel > Programs & Features. and see if there is anything installed that you don't recognize.
See if any unknown program is connecting to the internet. Close your browser and internet apps like chat. Wait 10 minutes. Then start a command prompt, and type in "netstat -abn" It will list the programs that have an internet connection, giving you the program name and ip address it is connected to. Find that program You can rename it from .exe to .found This will stop that program from executing again
Clean up your temp folders, as some times hacking tools are located there. Use this Temp File Cleaner from here:
http://www.geekstogo.com/forum/files/file/187-tfc-temp-file-cleaner-by-oldtimer/
Check to see if your antivirus is still working. Download this test virus from Eicar (
http://www.eicar.org/86-0-Intended-use.html ) and paste that line into notepad and save it. Now try to open that notepad file again, your antivirus should detect that. If it doesn't then something is wrong and you have to re-install your antivirus. Not that antivirus programs will detect hacking tools - they don't. But hackers usually wreck your security programs just in case they detect something heuristically.
Please keep a notepad file on exactly what you have done, step by step. If you made a mistake by disabling something important to the system, this way, you can undo the change.
Do you have any applications downloaded via Bittorrent ?
If you still experience strange behavior, you may want to start a thread in the Malware Removal Forum.