Only 400MB available to partition when I have 100Gigabytes available

I'm trying to dual-boot Windows 7 and 8 together, but when I go to shrink volume of my C:\, it says I only have 400 MB available to partition, obviously not enough to dual-boot. Someone suggested to defrag my hard-drive, I did that but only about 200 MB was gained, still not enough.

If someone could help me with this issue, that would be amazing!

Thanks!
~Prankster163

See earlier thread: http://www.sevenforums.com/hardware-devices/185566-i-need-help-shrinking-my-volume.html

This guy did it with "Partition Wizard"

Sub Styler said:

See earlier thread: http://www.sevenforums.com/hardware-devices/185566-i-need-help-shrinking-my-volume.html

This guy did it with "Partition Wizard"

Click to expand...

Trying it now.

It worked! Thanks for the refrence!

Works every time.

Rep to stylin sub.