I recently downloaded an application and then virus scanned it first with AVG (up-to-date), which reported no infection. However on executing the install, I suddenly had many real-time alerts from AVG about a virus (without Windows Firewall alerts). I exited the install but the alerts continued, reporting multiple instances of a “Skynet” and “packed.rolex” virus in my Windows\System32 directory. I seem to get ~15 reports when I start Windows (Vista Home Deluxe) and then at least 3 more every time I start a programme. A full AVG scan and Windows Defender scan found nothing. I followed your very helpful "8 Step Guide to Virus & Malware Removal" which seemed to find one trojan (see attached logs), however the problem still exists. Of note, the Malawarebytes' Anti-Malware caused the system to become unresponsive both on normal and safe mode whilst scanning, stopping on a file on my recovery drive (as set-up by Dell) “D:\windows\system32\config\security”. I then scanned the C: separately (log attached) and went through the “D:\windows\system32\config\” folder scanning files individually with Malawarebytes', where it again became unresponsive on the two following files: “D:\windows\system32\config\software.file” and “D:\windows\system32\config\system.file”. I am unsure as to the significance of this, but thought I would err on the side of caution and let you know. Sorry for the long post but I wanted to be comprehensive, many thanks for reading it all!