Is Lightroom 2 Vista 64bit a different installation file from the 32bit?

I'm just moving everything to a new computer that has Vista 64bit.

Is it a different installation file or is it one file for all? If different, where is that located?

Apologies if this has been asked before but i couldn't find an answer

I've got vista x64 and when I installed lightroom it automatically said do you want to install lightroom 2 x64 bit..

Thanks very much, I'll give it a go!
Didn't want to go through install and set up to find I'd installed the wrong version.