How do I get rid of XP Antispyware 2012?

It just got onto my laptop yesterday and I could tell it was a fake antispyware program because I've had one like it before, but I don't know how to get rid of it! I tried searching through my computer to find it and delete it, but It couldn't find it. Someone please help me get rid of this! I can't even go onto any webpages because it'll pop up as "Internet Explorer alert. Visiting this site may pose a security threat to your system!"