Try installing
Spybot - Search & Destroy __(FREE) (click on the link)...
Make sure you update it and run the immunisation before you run a full system scan...
If that doesn't detect it and get rid of it let us know what protection you are useing....We can recommend plenty more good reliable free apps you can try....
Also read through this sticky it will tell you what to avoid when downloading....
* WARNING: Viruses on network you should be aware of ! *