cant extend volume

[Internet Badass]

I want to combine some unallocated space with a partition, but it wont let me, but it will let me with a different one.

 

[Minotar]

I take it you are trying to extend D:\?

You can only extend from left to right using W7's software.
You will have to use 3rd party software like Partition Wizard - Best Free Partition Manager Freeware for Windows 7, Windows Vista, and Windows XP 32 bit & 64 bit. MiniTool Free Partition Manager Software Home Edition.
Dan

 

[mjf]

Partition Wizard comes highly recommended by people here.
However, when moving partitions around you are better to use the bootable version and not the installed (min tool). I found from experience that the mini tool can be unstable doing partition moves. (Best to have Windows OS out of the way).