Is there a checker available from a source other than the FBI?
My advice at present is to not go to the link. Download and run ComboFix (it’s the second button- blue and not the first button-yellow). http://www.bleepingcomputer.com/download/combofix/
The owner of the website link “dcwg.org” is Barry Greene, 11692 Westshore Court Cupertino, California. 95014 (I’m not going to post his phone # or e-mail address} It was created 04-Nov-2011 19:06:39 UTC.
Most computers ARE infected with some kind of malware. After running ComboFix, which most likely will reboot your PC a few times, give it one more reboot. The download and run Malwarebytes, http://www.malwarebytes.org/ (the download button not the buy button). When one first run it, after it’s installed and updated, select “decline” then do a full scan. When it’s done click on the button on the low right, then “fix now’.
If you want a really good anti-virus get F-Secure Internet Security, http://www.f-secure.com/en/web/home_global/home you can also run their cleanup toll at http://www.f-secure.com/en/web/labs_global/removal/easy-clean.