help my compaq keeps frezzing, i dont know whats wrong with it i have opened it but i cant see any problems. help

pc info

compaq presario 5000 series
1 ghz
128mb ram

i have had this computer for a few years and have had a few problems with it, the first problem was that the cd drives didnt open, next the modem installed on it didnt work, next something happened to the cpu, and at the end of all that compaq just gave me a new pc, the first pc i had was a dell dimension xps t500 which im using now until i can get my compaq workin the dell has worked great from the day i got it havnt had one single problem with it, its a bit slow but it works great its only 64mb and pentium 3.

It sounds to me like you got a Compaq Lemon But you can try to relaod the operating system next becasue you have replaced almost everything else and this is all that is left give it a try and that lemon might squeeze out some results if not I would sell it to the fruit factory and get a different Compaq