maybe installing wrong image

I don't think my problem is anything to do with the shadow package.
Perhaps your system is a little to overclever in assuming I wanted
to ask a question about that just because I started the registration
process from there, after poking around the site looking at various
things which were of interest but nothing to do with my problem?

My problem may not even be a problem, but if it is, it's this:

I installed Ubuntu 11.10 using wubi on this Compaq CQ2000 system
(Intel Atom 230 running the factory-installed Windows XP Home SP3)
a couple of weeks ago. I was busy and did not pay any attention to
the name of the tarball it downloaded. It worked alright EXCEPT that
it advanced the RT clock by about 45 minutes on every invocation, so
that advancement was retained through subsequent reboots and
system power-downs (so it was propagated into Windows). It may
have been exactly 45 min each time but I didn't pay much attention
to that detail until the last invocation yesterday, prior to uninstalling
it until I resolved it (and installed 12.04), when it was exactly 45 m.
The Windows Time Service is set to GMT+12 with auto-summertime:
the 45 minutes or so advancement within that was on LOCAL time.
As Ubuntu is now uninstalled, this problem is not a problem until
a new installation (of 12.04) displays the same behaviour, if/when
I will ask about it specifically. Meantime, it's the background to

what MAY be a problem is this:

On beginning to install 12.04, this time I paid more attention to
what wubi was doing behind my back, to see that the tarball it
was downloading referred to "amd" (which is not Intel) and to
64 (which is not this 32-bit system). So I cancelled it until that
is determined, so: THE PRIMARY QUESTION I HAVE HERE/NOW IS:

IS THAT A PROBLEM (if yes, how do I persuade it to get the correct
file), OR IS THAT THE (CORRECT) FILE THAT IT SHOULD BE INSTALLING
(and the amd/64 references are there only to wind users up :) ?

I also have an aesthetic problem with Ubuntu's toy building block
approach to desktops, so I installed the Gnome package (which
did not fix the RTC problem but did restore my ability to read whole
sentences without moving my lips). Thus a subsidiary question is:
will the Gnome package for 11.10 also be OK for 12.04 when that
is installed?

Thank you.