Strange behavior of browsers in Windows Vista

Good day Habraludi. The second day in a row I notice such a trend: using an opera with a large number of open tabs with long (!) Well-known sites, I notice what is happening that is not obvious. Willfully opens the existing tab of the site with a mildly illegal content (/index.php?traf=adparad - do not publish the domain intentionally, I do not like unpaid advertising). I would understand if a redirect occurred while loading a page or say within 5-10 minutes, which is already a lot. But opening occurs in an hour, two after loading the page. And in IE there were no such surprises. Downloaded Opera from the official site.

A detailed study of the sources on the sites from where the redirect went away did not give anything suspicious. Silent and KIS 7, and attracted to the aid utility from DrWeb- cureit.exe. In my entire history of web surfing, I have not visited such websites, well, I don’t like varesniki, pornushniki and other rubbish.

So what's the deal?
')
UPD : So, as a brief summary, downloaded the DrWeb Live CD , since it’s been registered as a beta tester for a long time. Briefly about the disk: a boot disk with stripped down to the required minimum of OS Linux. From the utilities, a graphical and command scanner DrWeb, mc, shell, built-in browser and some other useful gadgets, and the very part of the Windows hard disk mounted during the boot. Read more about the disc can be read on off. DrWeb website here . The result of dancing with a tambourine was a small but harmful virus that was not detected from under running Windows.

PS: As I read on one of the forums, Vista - one large legal virus by itself I don’t remember