1. You won't be able to play Halo PC with less than 256 MB of RAM.
2. You won't be able to play Halo PC with less than 64 MB of Video Memory.
3. Your processor is too slow to handle the game, too.
The following might be false but I ran Halo PC on a higher-end machine not so long ago and it ran like crap.
My PC:
AMD Athlon 64 3200+ OC 2.2GHz
1GB of DDRAM 3200
120 GB HD w/8 MB cache
NVIDIA 6800 OC 360MHz/730MHz
On the above with the highest settings and 1600x1200 res I don't get too much spare FPS.
2. You won't be able to play Halo PC with less than 64 MB of Video Memory.
3. Your processor is too slow to handle the game, too.
The following might be false but I ran Halo PC on a higher-end machine not so long ago and it ran like crap.
My PC:
AMD Athlon 64 3200+ OC 2.2GHz
1GB of DDRAM 3200
120 GB HD w/8 MB cache
NVIDIA 6800 OC 360MHz/730MHz
On the above with the highest settings and 1600x1200 res I don't get too much spare FPS.