Network boot is for large organizations not consumers. Why would you do something so totally reckless as to merge your Dual Boot partitions, when we were giving you careful steps to follow while awaiting a screenshot?
You haven't determined for sure you cannot boot a flash stick until you follow the steps in your other thread.
You'll need to borrow a USB CD drive to reinstall, or google how to carefully
remove your HD (no can openers) to move to another laptop to reinstall XP and then SysPrep to move HD to another computer
before moving it back.