fahcore is a program running on your computer that basically does some scientific work for the biologists at Stanford uni. Makes your computer work with other computers thus making a big supercomputer completing biological test.
http://fahinfo.org/
To remove you need to -
Check msconfig: Services and startup
Check services.msc
Disable or set priority
Or delete from registry...
You get it from cracked games etc so it can appear to a virus or spyware - but its not just some do-gooder cracker trying to save the world from cancer but also killing PC's.