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#21
A set of recovery disks to restore the original preinstall as welll as seeing a full system image will allow you to nuke any HP garbage off but only if you are sure you won't have to worry about any warranty since this is a brand new unit.
On any old laptop you would simply nuke the drive and start fresh to eliminate all of the unwanted OEM type "bloatations"! Here I would simply toss a clean install after a drive wipe for whichever edition, version, or OS is going to go on fresh and call it a day!
You could still see a working dual boot but risk potential problems with the Partition Table when going to shrink and lately re-expand the C primary. Saw that one happen before on an older XP desktop where the 7 RC was placed at the second OS. Once the RC was gone and the XP C primary expanded back the whole volume took a walk! Resizing itself can be risky at times.
For practicality you will likely find that replacing one edition for the more featured edition rather then the dual boot will leave you in a better place to begin with since you can run everything you have on the HP edition on Pro! The HP support site will pick up where the MS updates leave off as far as all the drivers you will need.