My PC keeps crashing after installing new software

Hi,

I was updating my version of Norton Systemworks when my computer crashed, and when I tried to restart, the fan in the power supply wouldn't even work. As far as I could see the PSU had blown. Since then I have replaced it with a higher wattage, but I'm still having problems. The system boots up but crashes either before or soon after windows has loaded up. The longer I leave the computer off, the longer it stays on before crashing. Its the same in safe mode and I've tried to uninstall Norton but it crashes during the process. I'm assuming its a software problem, any ideas?

GE Pro-M Motherboard
80GB HDD
1024MB Memory
2.4Ghz CPU
128MB Video Card
2 x DVD Writers
Floppy Disc Drive
450W Tagan PSU

 

I'm running Windows XP SP2 by the way.

Also, whenever it gets as far as having loaded up windows, i get a message from Norton saying something like 'Norton does not support the repair feature. Please uninstall and reinstall.'

 

Whilst I was just booting up my computer, I was taking a look inside my system to appreciate how quiet my new PSU was, when I realised the CPU fan wasn't spinning! I will be absolutely amazed if I haven't just stumbled upon the solution! I know its probably the first thing I should have checked with a problem like this but I was so distracted with the PSU and the messed up Norton installation! I just scalded myself on the heatsink so I'm going to wait for it to cool down before giving the CPU fan a good clean and reinstall it, and at worst, replace it. This should be problem solved. Thanks for your help Halo, I'm still going to need the info you found me to sort out the Norton installation!

 

Well I've just found a big dense lump of dust wedged in under the fan and when I took this out, the fan started as normal on the next boot. Its looks like its fine and shouldn't need replacing as it was only the dustball that stopped it spinning. I'll just have to take more care in keeping my PC clean! Thanks again.