16GB Installed (3.25GB usable)

[johnwhelan]

To the best of my knowledge an oem key only works for version of windows.
a Windows 7 32 Bit serial number will not work with a 64 version. It may install but it will not activate.
The retail version works with both.
Kenny

The only difference is OEM is only licensed for one computer, retail can be moved. If you are keeping the same hardware then 64 bit should not be a problem.

Cheerio John

 

[lewisner]

That made me take a look at the back of my Win 7 64bit OEM box.

Yep, it's there. I have no idea what an "OEM pre installation kit" is?

I built the computer, stuck in the disc and it installed just like a retail version.

I got an OEM version of Photoshop 2 with my first PC in 2003 (complete with CD key) and it has followed me around through 2 subsequent PC's and 2 rebuilds, no problems.