Here is what we use....it works really well;
Save these file to your Desktop ...
ComboFix -
http://download.bleepingcomputer.com/sUBs/ComboFix.exe
MalwareBytes -
http://download.bleepingcomputer.com...mbam-setup.exe
BOOT into Safe Mode (Tap F8 while booting ... Select Safe Mode WITH Networking)
Next run the COMBOFIX program by double clicking the file ...
After you start COMBOFIX there are a couple message you have to answer ... Answer YES to get the updates ....
Answer YES to all the messages "including" the RECOVERY CONSOLE ..
When it is done you will get a notepad open with a lot of gibberish ... Just close it then re-boot ...
When you are done with the COMBOFIX program then proceed with Malwarebytes ...
On the memory stick double click the MBAM-SETUP file to start the install ...
Take the defaults and just keep going to get it installed ... Next Next Next ... and so on ...
Once it installs it will do a quick check to update to the latest files ...
After it updates run a scan .. either the short or full ... The full will take longer but is more valuable ...
Once the scan is complete click the button to show results ....
While looking at the results click the button to fix all selected ...
When it completes it should ask you to restart, if it doesn't re-start anyway and see how it is doing ....
Good Luck!