How can I expand my partition space?

all that I can move from the C partition into the last partition. It seem to me too much trouble just to get that 43GB into the C partition. When you do that there might always be a chance something would go wrong as well.

You can use GPARTED which is widely documented, free but why did you create more than a C partition? It's not like anyone found it to save their files from danger or such.
Bob

for loss of all data.

So if you haven't already done so, backup any data you don't want to lose or can't afford to lose. Otherwise you'll be way more annoyed than you are now.

If you get that done and you still want to pursue repartitioning, then post complete details about the disk, the total capacity, the partition sizes and the free space.

Last consider adding another hard drive. May be the easier way to go and not have to worry about the repartitioning.

I've had very good success with Easeus Partition Master which I've been using for several years without any problems. The 32 bit version is free. If you're running a 64 bit OS, it used to be you'd need the Pro version which I believe is $40 or thereabouts. However I just checked the Easeus web site and it appears the free version also supports 64 bit versions of everything from XP to 8 now. Bob likes Gparted which must be good, but I've never used it.
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As others have said, whatever you do be absolutely certain to back up your C: partition to an external hard drive before attempting to resize it.

Under the OS own disk management service, you can access "contiguous disc space that are in preceding order" , ABC. Where B can merge C to B, NOT B to C. Usually under difficult circumstances using some "partition manager" is best and even then there shouldn't be some weird prior disk partition setup. In the long run if you're going to be needing more space, get a larger new HD(new/used) in order to physically have more storage. The other posters already touched on the topic quite well, I just summed it up as it were.

tada -----Willy

Open Disk Management, right click the last partition to shrink it, right click the C partition to highlight "extend volume" option and then, follow the guidance to finish the extending process.
Or you may prefer to use some partition resizing tools that could be your chances to go on, like GParted, IM-Magic Partition Resizer Free, EaseUS Partition Master, etc.
No matter how you decide to do, you'd better always save all your important data on another drive in advance.

Back up everything important well and take chances with this video tutorial that will teaches how to increase assigned partition space in details:
https://www.youtube.com/watch?v=6jCeT7CbsKk
It may help you.
Always save all important data well all the time.