New
#11
You will be able to delete and recreate partitions during the setup. The point in question now is why the disc won't boot. In OS versions past, if you tried a Dell OEM disc on an HP computer, it would give you a message that it wouldn't work and stop.
You keep skipping over some important questions though. What is shown on your actual disc, on the label? If it is a legitimate MS disc, you should be able to boot from it. If it is a copy, who knows if it was even done properly or if it is even bootable.