Malwarebytes Anti-Malware
Malwarebytes' Anti-Malware, short MBAM, is an antimalware scanner that can remove difficult infections where other famous scanners often fail.
MBAM can performe 2 types of scans:
Quick Scan: The scan is sufficient to remove all active malware. Depending on the computer and the amount of scanning files and folders, it can take up to 2 or 10 minutes to complete.
Full Scan: a hole wide MBAM scan on your computer. Here you can select which drives / partitions have to be scanned.
You can download MBAM here and here.