Hi Kaboose,
The problem is not with avast blocking this site. The detection is genuine as avast's Milos stated here.
The problem is with the webmaster of the site and/or the hoster of that domain for not cleansing the site from malcode that avast detects.
Furthermore the vbulletin software on that site was not updated leaving it open to vulnerablities that could lead to malcode injections.
So you should not try to circumvent an appropriate avast blocking of a site, but rather inform the webmaster of that site he has serious security issues.
Funny is that we get a lot of reactions like this. Avast detects malcode on a site and then users ask: "What can avast do about this?". Not a lot.
If something of a malware alert appears a lot of users try "to click this away as soon as possible, because it irritates them, putting themselves out to real danger of getting infected". I do not mean this personally but as a general observation of the common average user reaction.
Users just demand instant solutions and are easily irritated these days....
polonus