HELP!!! Im getting Stop Error Screens all the time

Hello,

I think something is seriously wrong with my laptop :(:confused:, because been recently im getting lot of STOP error screens (Blue) and when that happens the machine get stuck n i have to manually shut power and then turn on it again :/ Any one have any idea why am i getting these and how to fix this issue ?

Thanks

Machine Specifications

OS - Win XP Service pack 3
Intel Pentium Dual core 1.60 GhZ
3GB Ram