Cant seem to find this virus / malware

I have ran, malwarebytes, super antispyware, viper, sypbot search and destroy, ad-aware, Microsoft security essentials, trend mirco’s house call, none has seem to find it. Hijack this doesn’t show anything either.

Even after scaning with all these programs and nothing is found. Still every day i have a few different clients who are sending out emails with a virus link (ttp://www.qgh4.canxhealth.c0m)(changed some so no one clicks it) link changes some with each email. It’s sending from yahoo, and hotmail accounts. sends to about 7 different addresses at a time.

This one is driving me CRAZY, anyone have any idea’s?

Thanks