There was keyloggers hiding :(
They are now quarantined...
Let's see if there is something that shouldn't be quarantined...
Open AVG Anti-Spyware.
Infections
Quarantine
Click the following:
C:\WINDOWS\system32\sfc_os.dll -> Downloader.SFC.os : Cleaned with backup (quarantined).
Click on "Restore" and answer "Yes"
Go to virustotal.com
Copy the following to the box next to "Browse" button:
C:\WINDOWS\system32\sfc_os.dll
Click on Send
Wait for the scan to end.
Copy & Paste the scan results to here along with a one more HijackThis log.