Good luck. Sorry you have to leave.
This site did not give you a virus though. Nearly all viruses are spread through downloads. This site does not provide downloads. Viruses also usually come from places that have nothing to lose. They don't have a good reputation that they want to protect. They are "fly by night" operations. It would be stupid for me to take a risk like that with the site. Although it is possible for someone to upload an attachment to the forum and put a virus in that. If that happened they would be dealt with harshly and I would give you free tech support to fix the issue. I forgot who but I know someone recently uploaded a game they had made. I highly doubt there was a virus included but that would be the only possible way. If that did happen I am sure someone else on the site would have downloaded it and either had the same problem you are having or their anti-virus software would have detected it.
And don't ever install something with out having anti-virus software running. I use Norton 360 but AVG is free and good. -
http://free.grisoft.com/
You can use McAfee's Site Advisor to find out if the sites you are visiting are trustworthy.
http://www.siteadvisor.com/sites/retrouprising.com