conHook is a downloader trojan. It will sit there and helpfully download spyware for you, just as fast you uninstall it.
A real antivirus program should be able to get rid of it. You'll probably need to turn off system restore temporarily, and boot into safe mode to be able to completely clean this one out.
But kaspersky, norton, avg, f-prot, etc should all be able to get this.