Driver HELP !!!

Hi, I just noticed that I have both Asus Nvidia Driver and NVIDIA Drivers in add/remove programs. I was wondering if they are the same thing or if removing one of them will stuff up my system. I was also wondering which one should i remove. Also for some reason i have asus enhanced display driver.

I used to have a 7300gs (pretty sure it was an asus), then i upgraded to a gainward 8800GT, i cant remember if i removed the old drivers then.

I am asking because i am having trouble playing this freeware game called tagap http://www.tagap.net/ apparently its using opengl graphics or something. I am wondering if the 2 drivers might be conflicting with each other. where the characters are i get white boxes.

Any Help will be much appreciated
Thanks.

System specs:
Intel core 2 duo E6420
4GB of DDR2-667 Ram
320GB Hard drive (pretty sure its seagate 7200 rpm)
TV Tuner, CD/DVD Writer
Motherboard is a GIGABYTE 965p-s3
Graphics Card: Gainward 8800GT (double slot cooler)
PSU: Corsair VX550W
Running XP 32-bit