The extra account called ASPNET, sysdll? What about searching for spyware also, I dont know off hand of any spyware that would cause this behaviour but it couldn't hurt to rule it out. Get Malwarebytes Antimalware and/or Spybot Search & Destroy, install and ensure you run the update procedure and then run a scan to check for spyware/adware/malware/greyware etc. Run one at a time. I also recommend running disk cleanup to reduce the scan times. Spybot will try to delete all temp files on start up to help reduce scan times.