I am installing windows xp from windows 7 and getting blue screen while doing it

Please clarify your question as it makes little sense.

You have not really gave us some info on the blue screen of death. So I cannot give you a definite solution. However I can give you some info.

Stuff which causes BSOD:
*Bad file on the installation cd
*Your PC might be too old (highly unlikely!)
*Your PC might be corrupted with virus(es)

More info would be appreciated :D