How to repartition my system disk?

[StuartR]

My Windows 10 system disk has 4 partitions.

20MB EFI System Partition, 120GB C: drive, 450MB Recovery partition and 118GB unallocated.

I would like to move the unallocated space to be next to the C: drive so that I can expand that drive when I need to, but Windows doesn't seem to have the native capability needed to do this.

Can anyone suggest a (preferably free) tool that will do the job for me.

[Argus]

EaseUS Partition Master?
http://www.partition-tool.com/" onclick="window.open(this.href);return false;

[StuartR]

I'm downloading it now Argus, thank you.

[StuartR]

That worked perfectly. Thank you. It took less than 10 minutes to download, install, move the problem partition and deinstall again.

[Argus]

You're welcome.
And an inspiration; I've used it once or twice on the current setup, and haven't uninstalled it yet.