blue screen problem

[Pepsi™]

i have p4 2.0ghz ,256mb ddr ram, 40gb hdd, gigabyte845 motherboard.what happens is that i want to install win xp or any other operating system it doesnt get install instead a blue screen appears n i have to restart the system . could u suggest me what might be the problem.

[vandit]

plz mention exactly the kinda error u are getting plz... then people can help u out...