Please post back a screenshot of your maximized Disk Management drive map and listings:
1. Type Disk Management in Start Search box.
2. Open Disk Mgmt. window and maximize it.
3. Type Snipping Tool in Start Search box.
4. Open Snipping Tool, choose Rectangular Snip, draw a box around full map and all listings.
5, Save Snip, attach using paper clip in Reply Box.
Tell us what is on each partition.
You can install Windows 7 to a Logical partition if there is another primary to receive it's boot files. I dont' think I'd want them going on a Linux partition however. Better to add or convert a Primary.
In addition you must be concerned about GRUB corrupting Windows 7 beyond repair as it can if on the same HD. Dual boot Ubuntu-Win7