Hi all,
Thanks to Trader333 for brining this to my attention. One of the moderators must have deleted the thread in question, so unfortunately I didn't have a chance to cast my technical mind it's way. But I can assure you it is impossible to get a virus from merely viewing a webpage - whether this is a forum thread, a homepage or any other webpage.
To the best of my knowledge the ONLY way that you could be infected by a virus is if you opened an attachment or agreed to install something via a pop-up window. IE, you need to take a positive action to get infected by a virus - you can't be infected merely by passively viewing a web page.
It's a shame I didn't see the thread in question, but hopefully the above offers some reassurance. As regards scanning attachements for viruses, technically this is rather difficult to do - and although its not impossible, feasibily its not a small-undertaking - but I shall endeavour to look into it.