Sorry, all works properly now.
I reinstall oovoo and webcam driver and reboot.
But there is no reason for that error...
So, take my info, maybe it will be useful...:
-Microsoft Windows XP Professional
5.1.2600 Service Pack 2 сборка 2600
- Oovoo 1.5.1.93
-Genius SLIM 322 with latest drivers (from manufacturer's official site)
-Webcam was successfully used not only with other software, but with oovoo too.
P.S. Think... maybe it's webcammax plugin error??? 'Cause i uninstall it before reinstalling oovoo and drivers...