Your motherboard name/model would help...
If you're looking for hints/tips here are a couple:
1) Your CPU is a huge bottleneck for that graphics board. A new motherboard and 1GHz or better CPU will do wonders and not be too expensive.
2) More RAM will also be helpful. You didn't list your OS, but as a recommendation, Win9x kernels do well with 256 or better. WinXP is a RAM hog and 256 is a minimum. 512 is recommended.
3) Your power supply is 200W. The 9700pro will consume a bunch of that power. Grab yourself a new power supply. Antec TruePower supplies are rock-solid. The 400W will run around 70 bucks.
Skuzzy posted a great explanation of the AGP aperature size. It is located
here Hope this helps.
