PC Component to 1084S-D1 nvidia driver issues?!

[marquisor]

hello!

i just finished my scart -> 1084S-D1 cable (if you wish i can do a small draft of it and how the pins connected)
all working fine with f.e. sony ps1 and ps2. further not tested yet.

now i want to connect my PC to the 1084S-D1. for the real CRT feeling, mainly for running mame on it.

my videocard got a "dongle" with composite, RGB out (4 cinch).

1) i got a driver problem, i don't even get (after a driverupdate) into a setup what lets me choose component/FBAS/S-video output, videocard is gainward bliss 7800 gs+++ 512MB ram

2) if booting up to windows xp everything is fine (somehow got an s-video signal running on 1084S, connected yellow to yellow and red to red on my component -> scart adapter -> LCA cinch), but if in windows it switches to b/w

3) i can't even tell windows to set horizontal frequency to 50Hz... in bootup it should be 50Hz?

thx for ALL tips!
(of course if your answers help i will compose a howto post with all information to get it working.)

regards
marquisor