Windows XP Crashing - Help Please

Please can you help me, I am in desperate need of your superior help :)
my computer: Chaintech APOGEE m/b, Chaintech Geforce 4 Ti4600, creative soundblaster audigy, IBM 120Gb 7200rpm Hard disk, AMD Athlon XP 2200+ CPU, 256Mb DDR PC2700 RAM (Major)

My computer started to crash now and again (maybe twice a week), then its got worse and worse, everything freezing causing me to turn off the computer manually. At boot up the error message saying 'The computer has recovered from a serious error) then I can send or not send the information. It says the files associated with it are C:\WINDOWS\Minidump\Mini011203-01.dmp and

C:\DOCUME~1\Chris\LOCALS~1\Temp\WER1.tmp.dir00\sysdata.xml whenever I try to put this into search on my hard drive it says I cannot access it. So i formatted and put win xp back on, then as i was installing drivers it crashed again! It is gettin very severe now as it is crashing as soon as I log on and I cannot do anything. I can still move the mouse but when I try to close Internet Explorer, it half does and half doesnt. Eventually it just totally freezes and I cant move the mouse or anything. I have checked HDD, sound card, RAm and it doesnt seem to be them as it still crashes with new RAM, no soundcard.

Please help, perhaps a hardware failure, I'm not sure.

Thanks for any help.

Firstly if there's no worthwhile data on the disk you might like to run DFT on it, it is an IBM hard disk afterall..

Does the system crash/reboot if you just boot from a DOS disk?

Secondly what PSU do you have?

Third is the system overclocked at all?