As TanyaC mentions, your first task is to get the Windows 7 boot back. It might be a different process depending on how you added Grub to your system. But if it initially boots into Grub, using the
Bootsect.exe /nt60 SYS /mbr in an Administrative Command Prompt should bring it back to Windows. Some options such as
SYS, ALL or
/mbr might be needed, depending on where GRUB is installed. Use
Bootsect /help in the Administrative command prompt. If you were to use the Startup Repair option to recover the Windows 7 boot, it may take as many as 4 runs to get it back. If something does not work correctly, you may need recovery media to get into the Recovery Environment. If you do not have a Windows 7...