Increase system C: drive on Windows 7

My PC has a hard disk of around 460 GB
C: being almost full (60 GB), and D: occupying the rest of the disk, I succeeded to have a free space of 100 GB, reducing the size of D:
To do so, I first decreased D: by 100 GB (everything via normal Windows management tool)
But as the free space with after D: not before, I created a Z: disk there, moved all D: data to Z:, deleted the D: and renamed the Z to D:
But not when I try to increase the C:, the option to increase it is disabled
How can I fix this ?
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There is only 1 physical drive in the computer? I.e. all drives c:, d:, are on same drive? If so, I think you need to use a different program to adjust c:. Something like

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yes, windows 7 do not support expanding system partition (boot partition)
and you need another 3rd party software,
or remove the disk, connect it to another system and then expand it
10023Web site maintenance and designCommented:
Can you move all the data off the partitions to the right of C: and then delete D partition and go from there.  Recopy data back to what ever you create to the right of C: after adding to C:
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Alan HendersonRetired marine engineerCommented:
I had the same problem. This free tool does the job:

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LeTayAuthor Commented:
Wonderful tool !
10 minutes to fix my problem
Resize C:
Two reboot
Finish !
I'm glad it worked so easily for you. Aloha!

Happy Thanksgiving!
Against what has been said here: surely does win7 Support online expansion of c: to free space directly right of the c: drive. If that does not work, it's a file System/partitioning error.
Next time at least try to use diskpart on the command line to extend it.
list disk
select disk x
list partition
select partition x
LeTayAuthor Commented:
Indeed !
Many thanks
could you please try diskpart to expand a system drive and share your finding with us,  because I did try it and it did not work,  and not because a partion error
It works. I have been using it since it is possible (2006/vista).
10023Web site maintenance and designCommented:
I don't want to belabor the point...but I usually try to stay away from command line alternatives because it is usually not a user friendly experience.
I don't recommend downloading software because it seems now a days they are packing the downloads with garbage....
I mean even Oracle's java is slipping garbage past the enduser...even if you opt out on it, they still do it...can you believe it!!!
I don't mean to take away from could be clean...but I don't know that!!
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Windows 7

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