I had windows 7 on laptop and added ubuntu which worked well, i was then hit by a virus on the windows7 which basically stopped me from going onto the internet it then kept shutting me down so i removed the windows but kept the ubuntu which works great. i tried to reinstall windows but it will not work think it may need installation of a grub.
How can i reinstall windows and do i have to delete the partition it is on and re partition it
will need careful explaining as i am not a competent computer user as you can see
using toshiba laptop 250gb