removing GT Anti Virus

Hi all.

trying to fix the work computer, gt anti virus popped up on it yesterday. dont know how it got there i wasnt working! any who, installed MalwareBytes and did a scan, it removed the files associated with it. PC has been working fine since, except for the internet, everytime i open a site i get the same problem, an error page saying the site has been blocked because it reports as malicious. Obviously there is traces of the malware on my system still that weren't removed. I've done 2 full system scans with malwarebytes but it says the machine is clean. I've also done a scan in safe mode but still no joy. Attached is the hijackthis log. Would really appreciate it if anyone could help me!