Win xp usb problem

I have been trying to switch my one laptop from ubuntu to windows using winusb and a iso file. Every time i go to do so it tells me that bootmgr is missing. im not sure if its the winusb thats the problem or if i am doing something wrong. Please help.

Just unplug the flash drive. The computer tries to boot from the flash drive instead of the hard drive

Im trying to install windows from the usb. If i take it out, it will just run ubuntu.

Well I have an idea in mind but I really don't think I would know how to do it for windows XP. Have you tried using UNetbootin? That will install the bootloader into your USB so you can install your OS from USB.

i will try that, thanks