This is a discussion on How do i fix this? within the General Chat forums, part of the Knight Online (ko4life.com) category; ...
I've had that quite often aswell.
I usually try a restart of the computer. If that doesn't work, check your gfx card driver ( actually go to the cards website not letting it update from windows update ), and finally check windows updates.
After I've done those 3 things I can stay ingame all day without getting that message.
just had this error (happens rarely)
u got vista? i tend to force quit that dwm.exe file that lets u see a mini picture of alt tabbed things. See if that helps (doubt it might)