After installing Ubuntu I tried to install Windows 7 from a live USB and in booting this appeared:
Windows Boot Manager
Windows failed to start. A recent hardware or software change might be the cause. To fix the problem: 1. Insert your Windows installation disc and restart your computer. 2. Choose your language settings, and then click "Next." 3. Click "repair your computer." If you don't have this disc, contact your system administrator or computer manufacturer for assistance. File: \Boot\BCD Status: 0xc0000098 Info: The Windows Boot Configuration Data does not contain a valid OS entry.