Please post back a screenshot of your maximized Disk Management drive map and listings:
1. Type Disk Management in Start
2. Open Disk Mgmt. window and maximize it.
3. Type Snipping Tool in Start Search box.
4. Open Snipping Tool, choose Rectangular Snip, click New, draw a box around full drive map and all listings.
5, Save Snip, attach using paper clip in Reply Box.
It isn't a recommended backup method since HD's can fail, but if you have no other options we'll help you create a partition on the end of the HD to store your data. As long as you don't touch that partition during reinstall your data should be safe there.
While you wait look over these steps to get a perfect Clean Reinstall - Factory OEM Windows 7