Hi,
1. First u know about your(HDD) system information which os is supporting your system.(some time HDD is not supporting xp) based on HDD type at a time any one windows OS only u install.
ββββββββββββββββββββ
procedure
After u boot windows xp cd/dvd create partition like this c:,d:and e:
now u install your win-xp in C:/ drive.
after u boot vista dvd after loading file press Esc key now u see all drive , select d: or e: (don't disturb c:), like this u select d: now vista is installing your system, after you start your system now 2 menu is display like this
microsoft windows xp and microsoft vista ................. u login any one os
u want run both os at a time install microsoft virtual pc ..........
Report Me...........