win32.ramnit virus
If I were you I'd reformat just incase. I however don't use an antivirus on my computer since I mostly do web-based work and build my own programs. In future, when you download EXEs, I'd strongly recommend uploading them to www.virustotal.com where their automated system runs your file through a truckload of antivirus software, before you run it on your computer.
Edit: Another thing I'd recommend doing is checking Task Manager to see if your CPU usage has ramped up. I've downloaded some useful software in the past which liked to launch a pretty wack Bitcoin miner on my computer using IDM. I tracked all the changes it makes to a computer when it runs (Startup Registry Entry, and residing in the Adobe Flash Update folder) and made a batch file to destroy the miner when I am finish with the program itself.
If you're running Windows 8, and you see a peculiar looking program running on your computer, right-click > 'open file location' and investigate it for yourself.

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