Search results redirect to virus site

OK, what’s going on here?? I do a Google search for ‘rw lyall’ as an example. The site ‘www.rwlyall.com’ comes up #1 in the search results. If I click on the Google-supplied link, I get redirected to forcedscan.com/2009/etc., which pops up a message saying my computer may be infected with a virus and needs to be scanned. (This, of course, is the virus or spyware trying to get into MY system)

If I type the www.rwlyall.com URL into the address bar, the browser goes to the correct site as it should.

This happens with both Google and Yahoo searches. Has the rwlyall.com website been hacked, or is something else causing this?