I've read a lot about this and its variants. SD's link should work. MBAM is competent with this infection.
You might possibly need to rename the installer file, and the main executable once installed, to get it to run. Try the "normal" way first, though.
Superantispyware is another that's good for nuking many of the variants of this.
For prevention, if it was via a drive-by download, you need to disable or prompt for scripting in the browser.
If it was from happy-clicking, you already know the prevention means.