Need help deleting a program from computer?

I accidentally downloaded a program called security tool and its messing up my computer. How can I delete it permantly?

Security Tool is a like a virus. It is a rogue anti-spyware program. It gives false reports to scare users into buying their worthless product. The link has removal instructions that start about 40% down the webpage.

http://www.bleepingcomputer.com/virus-removal/remove-security-tool

Originally posted 2010-03-31 18:41:47. Republished by Blog Post Promoter