You have installed each operating system on a separate partition. I
assume you are using the Upgarde version of Windows XP. In this case, the
easiest way to do this is to do a clean install.
Make a full backup of all your data and settings, including e-mail
archives, address books etc., and boot from the Windows Upgrade CD, delete
the primary partition and do a clean install. Early in the process, you will
be asked to swap in and out the Windows 2000 CD as proof of ownership of a
qualifying version of Windows. After that, the process goes pretty much
unattended.
You then get a computer free of all 'legacy' software. You should be sure
to have new XP-specific drivers downloaded (download new drivers from the
manufacturer's web site rather than use the software that shipped with the
hardware). Make up a CD with folders of all such drivers and related
software on it.
Run Windows Setup and spend a few hours running all the upgrades and
service releases and other critical and recommended files that apply. Then
do a defrag once you've got an up-to-date Windows XP. Then set a Restore
point manually. Only then begin to install applications, one at a time, with
a reboot and a new restore point after each one. This takes much longer, but
you'll agree the benefits are well worthwhile. Just remember that full
system backup of all your data and configuration files beforehand.
