when i click try to play, a transparent window shows up for a split second and goes away, and nothing else happens.

My build is a... AMD Athlon 64 3200+ processor, ATI Radeon 9100 graphics card, windows XP, 2.20 ghz, 2.00 GB RAM

Okay when you say "still" I am curious of what you have tried doing to fix it so far.

Let me get you some helpful links...

http://forum.toribash.com/showthread.php?t=214180

http://forum.toribash.com/showthread.php?t=214461 <--- (Most likely your solve)

Try this:

Here