go back from 64bit to 32bit home premium vista

[Guest]

I have a computer that I have with 64bit home premium that I installed with a
OEM version, is it possible to go back to 32bit using that Key with a 32bit
dvd I already own or do I have to buy another 32bit

 

[peter]

The key matches the versions of Vista available........one key for
32bit..another for 64 bit.
If you own and have not installed a 32bit version you can use that
version..but with its key.
peter