amd 1,4 ghz computer freezes

Hi!
It seems like people here are far more skilled than I am. Since I bought my new computer a couple of months ago it tends to hang for some reason. Finally I freaked out and turned it over to my dealer, who is very nice, and I spent my last money from my student loan to have it fixed. They searched it for problems and claimed that the installation was faulty and did it for me with patches and upgrades and all. I went home, and of course it crashed. But not as often as before. But still. I cant c-alt-del, the only thing I can do is reset, it freezes totally without explanations. I've uninstalled everything that isn't necessary, like webcam and gaming controls and such... nothing seems to help.
What crap I'm using? No, it should be quite ok:
athlon t-bird 1,4 ghz, soltek 75drv, geforce 2 pro, 256 mb ddr, on win 98. Of course I'm turning it in again, but someone here might be able to tell if my computer is cursed or if the reason for the hang ups can be found...

Need more info, such as heatsink, cpu temps, and power supply. Have you loaded the latest driver from the nvidia website for your video card? I fixed my video problem by loading the generic nvidia driver, then reloading the driver that came with my gainward ti 500.

i wish i knew what fan i have and if it works. thanks anyway!

i'll tell him about trying different drivers and check the heat. i'm a bit sorry that i'm to unskilled to dare and understand how to do such things by myself.