I gave up on it en though i have systemworks 2003 and 2004 . I have been using Nod32 and not one single complaint. They have top notch scanning, updating and support. They often will update daily.
Trial version
http://www.nod32.com/download/trial.htm
You can see thier update releases here for yourself
http://www.nod32.com/support/info.htm#CurVersion