Windows Vista vista x86 ....64 bit question

[exposeuk]

installed vista this morning
put it on a new hdd
but when it game me the choice of what to install there was no option for 64bit
on x86
i have a AMD Athlon(tm) 64 Processor 3000+
is it a compatibility problem
or am i correct installing the x86

 

[Unregistered]

64 bit Vista isn't an "option" it's a completely separate version