64bit installed on D but now shows on C

For 2 weeks I've had Vista on C drive and Win7(x86) on D drive. I've just formatted D and installed Win7(x64) and now, whether I boot with Vista or Win7, the OS I'm actually using is shown as being on C drive. So, when I boot Win7, all the files relating to Vista - plus all the other files which I stored on C - are magically transferred to the D drive. When I boot with Vista, all is back to normal.

It seems strange that this happens only with the 64 bit Win7. The 32 bit version was installed on D and stayed there! Can someone explain this phenomenon?

Also, should I concern myself with the 2 'Program Files' folders, one of which has '(x86)' after it? Am I right in thinking that if a program is 32 bit (but still usable with a 64 bit OS) Win7 will direct it to the correct Program File folder meaning I don't need to 'browse' to the other one if given a choice when installing?

Many thanks.

Driver letters are dependent on the OS you're currently in. Don't worry about it.


About having two program files, that's due to 64 bit os. Your 64 bit programs will go in program files and your 32 bit programs will go in program files (x86)

That has me puzzled, as to why your Drives changed letters.
Did you install x64 exactly the same way you installed x86.
my msconfig shows my boot as:

Yeah, same install method (created a DVD and selected the drive which had "29.2 of 29.2 Gb free" - i.e. my D drive). It's not a problem but I just prefer the 'neatness' of having each OS stay in their own backyard.

I found Disk Management easily enough (didn't have to go through msconfig). I've not been able to work out what to actually DO in there mind. If there is a way to safely and permanently assign D to Win 7 I'd be glad to hear it.

Cheers.