Windows 7 Pro SP1 (64-bit), avast! v17 Free, MBAM Pro, Windows Firewall, OpenDNS Family Shield, SpywareBlaster, MVPS HOSTS file, MBAE Premium, MCShield, WinPatrol PLUS, SAS (on-demand scanner), Zemana AntiLogger Free, IE11 & Firefox (both using WOT [IE set to WARN, FF set to BLOCK]), CryptoPrevent, Secunia PSI.
[I believe computer-users who sandbox (Sandboxie) are acting prudently.]
on that basis, i would strongly suggest you generate and post a HiJackThis log, for analysis:
This will automatically open NotePad
Copy the entire file from NotePad: EDIT/SelectAll, EDIT/Copy
Then go to the forum dedicated for HiJack This logs (**NOT** back here), and PASTE the results there:
Be sure to include a detailed description of any problems/errors/warnings you are encountering.
Also, please indicate the steps you've already taken, if any, in terms of running anti-malware scanners or malware removal tools.
Hopefully, one of the HJT experts will get to it as quickly as possible.