Burn to CD free Partition Wizard bootable CD v.5.2: Partition Wizard
Now in Disk Management, mark C Active.
Reboot into Windows 7 DVD or Repair CD to Startup Repair - Run 3 Separate Times until Windows 7 starts on its own. System Repair Disc - Create
Boot the PW CD, confirm that C is now System Active. If so, rightclick E then D to Delete, click Ok after each. Now rightclick C to Resize, drag right grey border all the way to the right, click OK, Apply all steps.
In PW v.5.2 C should resize into Logical Free Space just like Primary Unallocated Space without Logical having to be converted to Primary first. If not, post back for further steps.