Upgrading from XP home editon SP2 to XP Pro

Currently I am running XP Home edition SP2. We have an install/upgrade CD for
XP Pro but at SP1, I purchased it last year from an OEM. I know that one
cannot upgrade Home Sp2 to XP Pro SP1 without either slipstreaming the XP Pro
CD we have OR un-installing SP2 on our home edition and then carrying out the
upgrade to XP pro SP1 from the CD and then applying the SP2 patch thereafter
to the newly upgraded XP Pro version.

I have read the various contributions on the discussion thread and decided
to go for the slipstreaming approach. It was advised by a MVP, suggesting the
slipstream products from the following sites:-

Windows Slipstreaming and Bootable CD Guide
http://www.msfn.org/articles.php?act...showarticle=49

or

AutoStreamer 1.0.33 (preferred)
http://www.wbeta.com/comments.php?shownews=1063&catid=2

The first site , among other things , advises that one must download nLite
as the slipstream tool to use. I did so , however, when I came to launch it
a warning window was displayed. It advised that it was risky to run the
product when the publisher could not be identified. I ignored the warning but
to my frustration my PC hung! [note: I also installed .NET 1.1 as advised by
the web-site instructions before downloading and executing nLite).

I tried the AutoStreamer tool too. The same problem arose - downloaded ok
but when I came to launch it the warning window advised that the publisher
could not be identified and to run the software was risky - this time I
followed the advice and did not continue.

Plan B: I did some further searching to see what advice existed on the
discussion group as regards un-installing SP2 on the current home edition. I
read of one "horror" story where a person had un-installed SP2 but then found
there PC to be in a "limbo state" and unsure what patch version they were at
and also they couldn't restore etc etc. All very worrying if one is
considering the un-install SP2 before upgrading to XP Pro appraoch.

Can anyone please advise on the slipstream products and the fact that the
publishing name seems to be unkown when I come to launch the tool. I have
Norton Antivirus running, XP Firewalls at its highest setting , pop-ups
blocked (apart from this site) and Spyware Doctor - what was I doing wrong?
Or, is it ok to un-install SP2 and start the upgrade from that base-line -
and I am needlessly worrying about carrying out such an un-install? Any tips
on carrying out an SP2 uninstall etc?

Any help / advice will be very much appreciated.

Regards
--
monsi