You have now found out how HP spells proprietary.
But don't feel alone. Compaq is Just as Bad.
It's nothing more than a way to prevent boot leg copies of Windoz.
And prevent others from installing the wrong disk on the wrong system.
Again Proprietary drivers for one won't work on another.
* Also The cure all for Some Tech support *
just reinstall to cure all you wows . Ya Rite
Now If you want to partition the drive the way you want.
Grab a copy of Partition Magic or one of the other programs
on the market and make all the changes you want.
After you run the HP restore/install..