There are a bunch of links from Google on how to remove.
Google-Remove Virus Heat
It looks like it most likely gets on your system through a virus. Do you have an up to date virus scanner installed on your PC. I would first boot in safe mode and run anti-virus and anti-spyware tools to see of they would remove it + the virus that installed it. If you can't get rid of it that way the first 2 results in google look like they are helpful.
Virus Heat Removal Process (remove Virus Heat) - PCHubs.com
Virus Heat - Remove Virus Heat Instructions and Virus Heat Descriptions