got the same shit twice last month. Dowload Malwarebytes’ Anti-Malware (giving you 3 locations):
http://www.download.com/Malwarebytes...-10804572.html
http://www.majorgeeks.com/Malwarebyt...are_d5756.html
http://projects.securitywonks.net/pr...s.php?file=158
download, install, unplug from the Net, reboot in safe mode and run the scan from there
if you need more detailed info:
http://www.lotsageeks.com/how-to-rem...rus-xp-2008-2/
all the best, this is a really tough one, it could take up tp a few hours to get rid of it
Once you clean your PC install that patch for the Adobe pdf reader (this is how I got it)