Launch System Restore, choose a Restore Point *prior* to the
installation of your, ahem, program, select any within the last few
days when your machine _was_ working_ fine_ .
Reboot.
"Arguing with anonymous strangers on the Internet is a sucker's game
because they almost always turn out to be -- or to be indistinguishable from
-- self-righteous sixteen-year-olds possessing infinite amounts of free time."
- Neil Stephenson, _Cryptonomicon_
