it should not keep popping up and you can stop it by using gpedit.msc
but what drive is it popping up for ?
unplug all usb drives, and make sure no cdroms are in the drives.
if the autoplay pops up click it and find out what windows is looking for.
it might still be looking for the windows xp disk in order to finish the disk compression, without it windows might not be able to finish what you have started and could leave you with part compression which is not a good idea.
if you find your windows xp disk put it in the drive.
next time windows pops open the autoplay follow it.
oh and just in case you do need to disable auto play it can be done the following way, but remember if you do this no drives will auto detect a disk, you would have to open cdroms from my computer.
click start , run
type gpedit.msc hit enter
this will show you what your looking for.