Problems with overlay

[TheJack]

So, here's the problem. I cannot play movies with ''use overlay'' enabled. If that's enabled, I get ''Overlay failed'' message, and the movie doesn't start. It doesn't matter, if I use Mode 1 or Mode 2. It's the same with DivX and XviD movies.

System:
VIA KT266 chipset (DFI AD70-SC)
athlon 900
Hercules 3D Prophet 4500 32 MB (Kyro II) with Hercules's latest drivers (16.55)
onboard sound (drivers from VIA's site)
WinXP SP1 (WMP 9)
DivX 5.05 (with everything enabled, except ''Yuv extended mode'' - if that's enabled, there's no picture) - I tried other versions
BSP build 497 - I tried other (older) builds

Strangely enough, ffdshow doesn't work either on this computer - there's no picture.

On my other computer (with radeon9000) everything works fine.