switch 64 32 bit vista

Hi! before proceding, i'd like to ask what to take into account when installing a 32bits Vista over the 64 bits version, same drive, partition, replacing so to say. (I'd like to run Vista with more driver and software compatibility.)
Thanks in advance!
f r e e

Just to let you know. You can't upgrade from 32 bit to 64 bit and vice versa, you will need to create a new separate partition on the same drive or, on a second HDD and do a clean install from the DVD, in other words boot from the DVD. -- Gregory P. Getchell
"F r e e" wrote:

Hi! before proceding, i'd like to ask what to take into account when installing a 32bits Vista over the 64 bits version, same drive, partition, replacing so to say. (I'd like to run Vista with more driver and software compatibility.)
Thanks in advance!
f r e e