I think u guys have alot of protections on your computer, like norton, zone alarm, spam-controller, spyware killer, all those filters.. and pop-up blockers..
if u have PMs and suddenly disconnected from this site, i recommend u guys disable the PM pop-up notifications.. because this forum scripts encourage to pop-up if u ever enable that option, and the usual defenders do not allow auto-popup stuff, resulting in disconnecting from the site..
if u are using firewall, enable this site to be used freely accessible.. and spyware and registry editor, they are not required to turn on if there's auto-protect options, and anti-virus, yes, u can turn it on... but u have to double check ur options if ur anti-virus is combo with firewall..
i use firefox to this site, and firefox can manually disable/enable the pop-up and access version on particular page.. so, u just allow the main site ozcardtrader.com.au and there shall be no problem.
hope this helps