Hi, sorry for barging in on your topic, but did you clean everything that AdwCleaner found or just suspicious files?

I’ve got the exact same issue since I plugged my usb memory stick into one of college computers a day ago. Avast didn’t find anything related with a full system scan.

AdwCleaner log:

# AdwCleaner v5.007 - Logfile created 15/09/2015 at 12:13:12 # Updated 08/09/2015 by Xplode # Database : 2015-09-10.1 [Server] # Operating system : Windows 7 Professional Service Pack 1 (x64) # Username : User - USER # Running from : C:\Users\User\Desktop\adwcleaner_5.007.exe # Option : Scan # Support : http://toolslib.net/forum

***** [ Services ] *****

***** [ Folders ] *****

Folder Found : C:\ProgramData\EmailNotifier
Folder Found : C:\Users\User\AppData\Local\Innovative Solutions
Folder Found : C:\Users\User\AppData\Roaming\dvdvideosoftiehelpers
Folder Found : C:\Users\User\AppData\Roaming\WebExtend

***** [ Files ] *****

File Found : C:\Users\User\AppData\Roaming\Mozilla\Firefox\Profiles\w1tq8ttt.default\Extensions{b64d9b05-48e1-4ceb-bf58-e0643994e900}.xpi

***** [ Shortcuts ] *****

***** [ Scheduled tasks ] *****

***** [ Registry ] *****

Key Found : HKCU\Software\Google\Chrome\Extensions\nikpibnbobmbdbheedjfogjlikpgpnhp
Key Found : HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects{EE932B49-D5C0-4D19-A3DA-CE0849258DE6}
Key Found : HKCU\Software\Microsoft\Windows\CurrentVersion\Ext\Stats{EE932B49-D5C0-4D19-A3DA-CE0849258DE6}
Key Found : [x64] HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects{EE932B49-D5C0-4D19-A3DA-CE0849258DE6}
Key Found : HKCU\Software\Softonic
Key Found : HKLM\SOFTWARE\SiteSee
Key Found : [x64] HKCU\Software\Softonic

***** [ Web browsers ] *****

########## EOF - C:\AdwCleaner\AdwCleaner[S1].txt - [1539 bytes] ##########