1/. This may help but if the problems are in ME reverting back to it isn't going to help .........
How to uninstall Windows XP and revert to a previous operating system
2/. This method of XP install from an upgrade disk will give a full clean XP install and not drag the useless ME files with it.
a. Set your cd rom to first boot in the bios
b. Put the XP upgrade disk in the rom drive
c. Cancel auto run
d. Reboot
e. Hit any key to boot from cd when prompted
f. Delete partition
g. Create new partition
h. Format and install Windows XP
NOTE 1: This will completely wipe your hard drive, back up all important files first.
NOTE 2: During this process the Install Wizard will prompt for a previous operating system disk to verify prior Windows ownership, any Windows OS disk apart from 95 will suffice to achieve this.