bros...newbie here...

i got a big probs...

last year, i bought ACER ASPIRE 4736G
specs : - centrino, core 2 duo T6500, nVidia GeForce G105M Cuda 512 MB, 4GB DDR2 RAM, Vista home premium build in.

now...i wanna change the OS...

vista home premium to Windows 7

when i insert the DVD, a pop up shows that "incorrect CD, not current version bla bla bla......"

i tried to reboot n press F8...(just noob n dunno how to do format correctly for vista)...just do the same as XP...but after the W7 DVD was in the dvd drive, n after press F8, no menu of boot from CD...so, how can I change the OS....?

help me pls.....