Well guys, Ive got a problem here,

Until recently, ive been playing online games with no problems, whatsoever. About a week ago, my games just started to freeze non-stop. So I looked to see what the problem may be. I play Half Life-TFC and you can run in 3 modes : software, opengl, and d3d. I can run software quite well, the other 2, which look alot better, freeze when i first join a server when using them. When they freeze they do so on a sound loop thats continuous and I have to reboot each and every time they occur. I do have temperature problems also, about 60 C or so when I play games. Not sure why its so high. These are my specs, any and all help is much appreciated, Ive reinstalled windows about 3 times to no avail each time.

Win 98SE
Biostar M7MIA
AMD Athlon 1.33 w/raid
GeForce 2 Pro 64MB
256 DDR
SB Live
Maxtor 40GB

Really in desperate need of help, any help is appreciated.