my pc shutdown when ever i play video online or converting media or dvd...

[AJAYTHEJOGI]

...burning or any kind of process...? processor: celeron(r) cpu2. 41 ghz, 448 mb of ram

system type: 32-bit operating system

windows edition: black xp ultimate

 

[Toby]

1) Possibly because you're running a pirated OS.

2) Possibly because your computer is overheating:
2a) 4.1GHz is far too much overclocking, especially for a celron.
2b) Get some canned air and blow the dust out from the inside of your computer.