Hi
I have got a new toshiba laptop with an AMD Turion64 x2 cpu and 2gb Ram
vista home Premium 32bit OEM.
I would like to know i can install a 64bit version of vista using using my
same product key i do understand i would have to unistall my 32bit version.

MICROSOFT SOFTWARE LICENSE TERMS
c. Alternative Versions. The software may include more than one version,
such as 32-bit and
64-bit. You may use only one version at one time.