This must be something new that started this week. As of May 2nd this happened to my site as well...
www.camasvalleyfundays.com
I am currently in the process of re-uploading my entire file database back to 4/1/12. If that doesn't work I have no idea what to do from here. I've looked on .php file and dont see anything out of place or additions with opoluicenotgo.ru written in it.
if you click that link it goes to my forums, but my index is missing and if you go to google and search camas valley fun days, click the first link you get that opoluicenotgo.ru link saying its a virus....No bueno