[ravi_9793]

I have ur solution...follow this
start-right click my computer-properties-advance-click the setting of"start up and recovery---a new page will open-edit -u wiii find something like this..
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOW S
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Micro soft Windows XP Professional" /FASTDETECT /NOGUIBOOT
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Micro soft Windows vista" /noexecute=optin /fastdetect


delete the line containing the vista.

restart the system...u have done