Sorry guys . sounds like you guys have a nasty redirector on your system ..
 Id suggest getting a good antivirus and spywae detector ( yerp they are different) and doing a bit of a clean up.. bet ya running avg or some crap
 download a trial of panda antivirus and install then update a copy of the free spybot program  then scan your pc's
 some websites will ask for a password before accessing info  and thats normal for locked forums/galleries but why the copy of ozvmx that escapes me unless its a redirector
 Hijackthis will help in that respect and  is freely available 
http://www.download.com/Trend-Micro-HijackThis/3000-8022_4-10227353.html to analyze copy the log file and paste it into this website 
http://hjt.networktechs.com/ cheers