I just installed Ubuntu 14.04 in a dual boot configuration. I have my original Windows 7 installation on my C: drive and the new Ubuntu 14.04 installation in a partition on my d: drive. GRUB shows my Windows 7 as a boot option, but when I try to boot into Windows 7 it hangs at the "Starting Windows" splash screen.
Unfortunately I didn't find out until after this happened that Ubuntu has had a problem dual booting with Windows for 3 years. Something in Ubuntu's boot loader destroys what Windows 7 needs to boot.
The hardware is a HP DV7T-6C00 laptop.
I tried boot-repair which didn't work. I also tried using MS System Restore from the HP recovery disk which didn't work either.
How can I solve this issue and dual-boot Windows 7 with Ubuntu?