Just to clarify so everyone including myself can understand the problem
You said
"i ve formatted my my sony notebook which already had windows vista."

Does that mean that the hard drive is blank at the moment or you have Vista on the hard drive and you formated a partition on the hard drive ?

You also said
"i tried using xp cd .
it couldnot detect hard disk.
it displays check your hard disk is properly connected to ur computer
or it may require manufacturer driver."

Sorry maybe I am just not good at understanding short hand writing

Are you refering to bios not detecting the hard drive or are you getting the error during the xp installation ?