Hi Radair, I run the BX Wiki site at bxtractors.info, or more accurately I create the tractor-related stuff on the site. The underlying software is a Wetpaint site, and the ads, layout of banners and menus etc is controlled by Wetpaint. I'm sorry you had trouble with it - your case is the first I've heard of anyone blaming it for malware.
Wetpaint allows people to create wiki sites like this for free any topic - but as a site creator I have to put up with ads on the site. I have no control over these ads but from what I've seen they seem to be from respectable companies and I've never noticed any malware. I could pay Wetpaint to make the site ad-free but as I get no revenue from the site I'd be out of pocket.
The creators of malware are clever at hoodwinking people and exploiting vulnerabilities in web browsers and other software.
The best advice for any web surfing is to make sure browser and other software is always up to date and to run well-rated anti-malware software. I can recommend some but this is tractor site - not a PC site.
Radair - you think you acquired the malware simply by mousing over an ad, and not clicking anything. That type of infection is rare, my research suggests it is more likely if you are using an older browser, or one with some of the recommended security settings (especially javascript settings) disabled.
Probably the safest thing to do if you mouseover something and a suspicious popup appears is to ignore the popup and close the browser completely.
Also advisable, but sadly not practised by the average user, is to create two users on your computer - one an Administrator which you only use when you need to install some software, and one a Standard user which you use for everything especially web browsing. That way, if you visit a site that tries to install malware it will not have the administrative permissions to do so.
Finally, there are websites where you can check if a website is distributing malware or not. The AVG Online Web Page Scanner is one such. There is also the Google Safe Browsing tool which is apparently built in to the chrome and Firefox browsers, but you can also use it by entering this URL into your browser, followed by the website you want to test ...
http://www.google.com/safebrowsing/diagnostic?site=
so to check the BX wiki you would enter
Google Safe Browsing diagnostic page for bxtractors.info
Apologies for the long and technical post - but I've put a lot of time into the BX wiki site creating an supplementary online manual for other owners and I'd hate to think it would go to waste because people are worried about malware on the site.
Also if anyone thinks they found a malware-infected page on bxtractors.info please let me know and I'll flag it with the Wetpaint administrators. If it's on that site then it's almost certainly on hundreds of other Wetpaint sites and they will be keen to eradicate it.