Xfx 5200 Problem.

Ok, here's the thing:
Last may I bought a XFX 5200 128 Tv/DVI out.
And last nite had a HUGE problem (2 actually)....

1º_I never really paid any atention to it, but I have a JVC TV, with NTSC, PAL-N, PAL M and auto-detect. Here in Argentina, the color system is PAL N , but when I use ntsc, everything is ok, except for one thing: The TV has some kind of interference, some kind of horizontal white lines that makes my TV blink... (like when You see a screen while is being filmed.. ), and kinda hurts my eyes.. In pal, i can only see in B&W.... and strangely.. it has a better definition...

2º_ Last nite I updated to the latest driver for XP pro.. and well, I rebooted and all that, everything was cool... but this morning when I turned on the pc, it just wouldn't start (This pc has 3 months only) I feel it has something to do with the update i had done....

3º_ Before I formatted my HD and reinstalled windows XP pro, I has warcraft 3 running at max resolution and detail.. and now, I get some kind of delay...
i mean.,. c'mon, my pc is damn good..

P 4 1GB ddr 333 mhz--
Xfx 5200
80 GB 7200 WD
Mobo intel D865 perl.sound blaster live 5.1 creative...
monitor viewsonic e90fb

Help would be appreciated.