Reinstaling Windows 7 after dual boot with Ubuntu 14.04

Question

I have old laptop which I need to sell. Laptop runs Windows 7 and Ubuntu 14.04 along. I need to reinstall back just Windows 7 bacause of customer wishes. But I have a problem. When put cd with Win 7 and press F12 to call boot menu, it dont load, it just overides cd boot and takes me to Ubuntu purple screen which system I want to start up. To be clear, I want to format whole disk with existing dual boot (Wind7 and Ubuntu) and just install clean Windows 7 to be ready for customer. Thanks

Answer 1

do this steps

1. restart your pc and press f2
2. go to boot section
3. enable usb
4. save
5. restart
6. press f12
7. select usb
8. delete all the partitions
9. install a fresh copy of windows 7
10. done