Malwarebytes Anti-Malware is pretty good along with Avast or AVG free editions. They should help clean it up, if not you'll have to invest in proper AV protection, remove it manually or get somebody else to do it for you.
The best Anti-Virus I've used is Kaspersky Anti-Virus, yearly subscription but does a good job of keeping the system clean and doesn't use up too much system resources. The worst 2 are Norton and Mcafee by a long long way, avoid them!