How do I get rid of Mirar off my computer?

Can someone tell me how to get this off my computer? I am getting spammed with popups and my computer is really slow. I can't even open IE without being hoarded with popups. I have spyware terminator and have ran it serveral times, but Mirar is still there. I've tried the add/remove, but it won't let me delete it. I've tried system restore, but it only lets me restore back one day so that doesn't help much. I am getting irritated so please help.