buy a new bigger heard drive
get hirens boot cd 9.8 or newer
install new drive
boot from hiren disk
use ghost in disk to disk mode and it will transfer 100% of your drive and you can remove the old one, and set the new one to boot and voila, now you have your old system along with more space.

you can then format the old one and install it as a secondary drive for storage purposes.  or use the old harddrive as an extra boot drive to try other operating systems.