There's a sticky at the top of the compute forum, but basically it's this...
First of all disable your system restore.
Download and install Malware Bytes, update it, let it do a full scan. Then delete whatever it finds.
If you're still not sure about whether it's removed or not, then read up about Combofix. Just make sure you know exactly what you're doing with Combofix because it could potentially delete files your computer need to operate normally.