Use free Partition Wizard
bootable CD to rightclick Recovery to Delete, click OK.
Then right click C to Resize, drag left partition border to the left to take up the deleted space, click OK, Apply all steps.
Back up your files and make a System Repair Disc - Create
first as there is a slight risk when resizing on the boot sector to lose Windows 7 boot, in which case you would run Startup Repair
a few times to repair the System boot files on the Active partition.