Depends. But probably by the sound of it.
Update your browser just in case. I've got a link to chrome in the sources. But you can update by clicking on the wrench icon, and scrolling down to "about chrome" updates automatically through there.
If it is a virus its probably just on your computer though, not the router. I'd suggest downloading the following few bits of software.
Also if you're using IE, i suggest getting a decent browser (I have a personal hatred of IE both as a user and developer) I personally recommend google chrome, but some people prefer other browsers like opera, safara, or firefox. I'll link chrome too
1: Anti Virus (if you don't have one) I'd say if you're on win7 or vista go to microsoft site and download microsoft security essentials.
2: Anti-Spyware:
I have several anti-spyware software installed. spybot s&d. Malwarebytes, and Spyware Blaster.
3: cCleaner: Just because its nice to have a tidy PC
Install the above software, update and run and hopefully it'll solve any problems.
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To the latest update. You've got yourself a nasty virus (i say nasty, annoying is a better term) which has hooked itself in through the network to your various PCs. Here is your best option now.
Start up your PC in safe mode with networking
update your anti-virus etc through that, and run them through that. It SHOULD stop the virus interfering
Those types of virus normally come when you've downloaded something via torrent, or installed a piece of software with it attached. Some of them are easy to remove, others are a pain in the ***. Any chance you can take a screenshot of the page its taking you to and posting it via imageshack or photobucket?