New
#11
+1 The Reaper
It takes in average ~20 minutes online time for an unprotected computer to become infected.
So running without any decent protection is asking for trouble.
Since you haven't done much yet, the suggested course of action would be
#1 Restore the computer to factory defaults one more time (much simpler than trying to hunt down some nasties)
#2 Install a decent A/V program ASAP for example
avast! Free Antivirus - Download Software for Virus Protection or
Download details: Microsoft Security Essentials
get this one as a "on demand scanner" just because it's very good and might save your bacon some time
Malwarebytes : Malwarebytes Anti-Malware is a free download that removes viruses and malware from your computer
As for your rights-problem with the libraries I think you have to take ownership. Have a look here
Take Ownership Shortcut
post back if you need further assistance
-DG