not able to suppress a partition

[tartarine]

hello
I have an hp Probook 6570b, with windows 7 Pro 64 bits. Hard disk 500 Go
My partitions are
C, NTFS,286 Go
D , NTFS, 156 GO
HP REcovery
HP tools
System

I am running out of space on C.
I wanted to extend C (right click on C , I can only reduce but not augment)
I tried diminishing D , OK, I get then an space, not alloted, which I can not make part of C
I could even suppress D completely, the content is also on an external disk, but some how
I can't manage to do that.
Could anybody give me a step by step procedure ?
the exponations of Microsoft don't seem to work for me
I also tried to rename D in B so that the Partition is right from C but no avail.
thank you for your help
my windows is in french so excuse me if the translation is not official

 

[AddRAM]

Use Partition to work on your partitions.

Bootable Partition Manger | MiniTool Partition Wizard Bootable Edition

 

[Kaktussoft]

Please post screenshot of diskmanagement.

You can do it like this How to Extend Partition | MiniTool Partition Wizard Tutorial
Or How to Move/Resize Partition with partition manager? Partition Wizard Move/Resize Partition Video Help.

Free download Magic Partition Manager Software, partition magic alternative, free partition magic, partition magic Windows 7 and server partition software - Partition Wizard Online (take the Free Version). Be sure you click the correct "download" button! (not Free download)