Bit of an update to put you guys at ease, aslong as you have the October Microsoft update patch KB958644, then your immune to it, if your unsure, then do the following


Tools > Windows Update > View Update History

then look for it


Also, just to be safe, do a full system scan to make sure that you dont ALREADY have it, several Anti-viruses were patched to detect it and severals programs were developed specifically to detect JUST that, look em up.