I need to uninstall windows XP spyware alert (that isn't what it is called) It wont go away!?

My microsoft updater showed this "update" I needed, I clicked on it and without a subscription it is just this annoying "YOU HAVE 70 VIRUSES AND 16 POTENTIALLY DANGEROUS SPYWARE PROGRAMS!!!" I cannot uninstall and when I go the the help screen my computer says the site is not trustworthy!!! It is XP something, has anyone heard of this? Please help!