Black screen since Acceleration Install

I've been a FS2004 user for a long time but I just picked up my copy of FSX Deluxe + Acceleration today.
The FSX Install went fine. At the end of the install, it asked me if I was new to fs, returning to fs of a pilot. I choose the pilot, got a scripted video and landed a 172 at Oschosh(spelling?).
I then installed the Acceleration Expansion. Since that, I get a black screen when trying to fly. When I choose a plane, the 3d render is a black box. The simulation is working because I can hear the sounds and the throttle works.
I'm running XP SP2.I'm using a Gf7900GT with latests drivers (just downloaded 163.71_forceware_winxp_32bit_english_whql.exe and the problem persists).
Anyone had the same problem?
The FSX Install went fine. At the end of the install, it asked me if I was new to fs, returning to fs of a pilot. I choose the pilot, got a scripted video and landed a 172 at Oschosh(spelling?).
I then installed the Acceleration Expansion. Since that, I get a black screen when trying to fly. When I choose a plane, the 3d render is a black box. The simulation is working because I can hear the sounds and the throttle works.
I'm running XP SP2.I'm using a Gf7900GT with latests drivers (just downloaded 163.71_forceware_winxp_32bit_english_whql.exe and the problem persists).
Anyone had the same problem?