Unfortunately GRUB can render Windows 7 irreparable until it is wiped from the HD.
How many times did you run Startup Repair? It sometimes takes 3 tries with reboots to repair or rewrite the System boot files. Again GRUB can render this irreparable.
Make sure the 7 partition is marked Active: Partition - Mark as Active,
or use free Partition Wizard
bootable CD to mark Active, then click on HD to highlight and from Disk tab select Rebuild MBR
which may preclude the need to run repairs.
Does the Repair console find an installation to repair, and is it listed correctly? If not try to jumpstart by running from Command Line bootrec /fixboot
and bootrec /fixmbr
Otherwise it may require wiping the HD of GRUB since deleting its partition and resizing over it does not wipe it's code which may have corrupted the boot sector. SSD - HDD Optimize for Windows Reinstallation
Try writing to USB your Recovery disks first as Theog is urging if you don't have them as the Recovery partition would be wiped out by this.
Then run the Recovery stick, or find a Windows 7 installer for your version to clean reinstall using the Product Key on COA sticker: Reinstalling Windows 7