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An upgrade disk that is 64-bit will allow you to do a clean install, yes. As
others have pointed out, you may only have a 32-bit disk, or you may only
have a license for 32-bit, you'll need to verify that. And you can't do an
actual in place upgrade, but must do a clean installation because of the
change in architecture.

--
Charlie.
http://msmvps.com/blogs/russel




"plod" <> wrote in message
news: o.uk...
>I have recently upgraded Windows Vista Home Premium SP2 to Windows 7 Home
>Premium 32bit.
>
> My desktop has 3.37 GB usable RAM and I am now considering doing a clean
> install to 64 bit.
>
> Is this possible using the Microsoft upgrade CD, please?
> --
> plod