Intallation error in vs 2010 , urgent pls

Question

i have core 2 duo intel processor,windows xp sp3,
2 gb ram,& 2.93 ghs
 in my system.
when i am installing the vs 2010 profession im my system then setup starts but after that
setup cant able to install "ENU",what is that "ENU" that i dont know and
i m gettting error:file:->"vs_setup.msi is not valid"

pls any one help me and its very urgent pls,  
i have use this setup in another system that system had not given me error

thanks in advance pls help me if u can