i got da Answer man
lek shu bta3mel
iza 3endak el Other operating system is Windows XP
3meel Right Click 3ala my computer---properties
Go to Advanced---Ta7et el Startup and Settings..Press Advanced
now hoon bebayenlak all the operating systems on the Computer
Press EDIT and it opens a text document...then Delete the line that contains Windows Vista..which actually looks like this
"multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Micr osoft Windows Vista...."
save the text and press apply bla bla bla..w restart UR pc w Tell me shu bseer ma3ak
..Hop It Works With U