I've just installed Ubuntu on my laptop on dual boot and now I can't start up on Windows 7, I don't have the GRUB menu that allows me to choose an OS.
When installing Ubuntu, I reducted my Windows partition to make more free disk space in order to create Ubuntu's partitions. I think it corrupted my Windows partition.
Can you help me recover my Windows partition ? Even if it means losing Ubuntu because I don't mind reinstalling it, whereas it would be very long to me to reinstall and setup Windows.