Hi
If you have data on the computer that you need to save then you don't want to do a complete reinstall.
You can try a repair install but some of the things you already did may have made it worse.
You really shouldn't have deleted the boot partition.
If you have a Windows Disk that includes Service pack 1 you can just follow these steps....
Repair Install - Windows 7 Forums
If you don't have a disk that includes service pack 1 then you have to uninstall service pack 1 which may not be possible if you can't boot.
How to uninstall Windows 7 Service Pack 1 (SP1)
If none of these are an option you can create a Ubuntu disk on another computer and boot your computer from it to backup the data you don't want to lose to another drive or disks.
Desktop | Ubuntu
Then you will have to do a complete reinstall of Windows 7 from your original DVD.
This will completely wipe your hard drive.
It really pays in the long run to back up your installation.
I use Acronis True Image but the native on built into Windows 7 will work and allow your to create a bookable Windows DVD for your computer.
Mike