arg...i need help with my framerates

here's my problem...i am unable to break the 15fps barrier which seems very low for my 'puter ( specs below ). when i go into the advanced display settings in cfs2, i am unable to check the enable hardware box. I have tried to change various settings in my display properties to correct this, but i can't seem to remedy it. i have tried the 3d programs like rivatuner, geforcetweak, etc but all to no avail.
any and all help would be greatly appreciated, so thanx in advance!
sys specs as follows:
amd duron 1.2 ghz
geforce ti4200 128mb vid
512 megs ram
sb live! soundcard
windows xp home.
again, thanx for any help!
any and all help would be greatly appreciated, so thanx in advance!

sys specs as follows:
amd duron 1.2 ghz
geforce ti4200 128mb vid
512 megs ram
sb live! soundcard
windows xp home.
again, thanx for any help!