Can't resize my partition

As far as Disk manager goes, it has to be continuous free space for it to be able to use it.
It sounds like you have [Files]{free space}[files]{free space}. The last free space being 40 GB. And depending on what the files are the standard windows defrag won't always move them. If they are in use and locked by a program it won't touch them. You'll likely have to boot up to a utility to do it and not run it from Windows. I'm not that familiar with the Mini tool so I can't tell if you are running it from Windows or bootable media.

You just made a mistake, click the drive that needs extend from the list and all options should become available.
Without clicking:

As you can see all options are greyed out, but after clicking they are all available.

When I click the 100 MB or the C: partitions, the only options available are Delete, Copy, and Properties. The 17.7 GB partition (which now shows up as "Samsung_Rec") does have all options other than Create available though. Btw, can I get rid of this last partition, or is it necessary?

I'm not using Wizard from boot. Would that help? I used Auslogics Disk Defrag, but I didn't do the optimization option. I couldn't find any options in that programs for degrag from boot. Do you know of any good programs that can do that?

I was starting to think the problem was caused by Trucrypt, but their documentation says that you can resize a partition on an encrypted system so it shouldn't be a problem. I'll decrypt it if I have to but it will take almost a day to complete so I'd love for that to not be the problem.

Have you tried to right click the drive > extend? If it's greyed out again then I would suggest that you delete the partition, extend the primary partition and re-split it
2.I got rid of the System Reserved partition and then I had to reinstall windows, I wouldn't advise you to do it.
3.I'd suggest trying out Iobit Smart Defrag it has boot time defrag for pagefile, hibernation file, MFT and system files.

Booting from what ever program you want to use to resize the partition will definitely help. If windows isn't running none of the files will be in use. If they are not in use they are not locked out and can be moved. Most portioning utilities are quit capable of moving files to free up space, provided the OS doesn't have them locked out.

MiniTool partition wizard asks you to restart in order to split or resize the partition, It doesn't process live, after you restart it enters a boot mode and performs the actions there, Nayr747's problem is that the options are greyed out.Unselectable.

Extend is greyed out. Delete the samsung_rec partition? Will that affect anything negatively?

Yeah like Emoclaw said, they're all greyed out so I can't do anything. I guess I'll give Iobit a shot and report back.

I believe that partition exists incase you want to backup, if there is no data in it then no, it wont affect anything.But if there is, I'd suggest that you keep it as it may contain important data from your manufacturer.If it has data I would suggest that you use EaseUS Partition Master Home Edition.Instructions with screenshots below.

1.In EaseUS, right click the C: drive and click Resize/Move

Edit the Partition Size according to how much you want the C: drive to have remained(Example, I have 470 GB and I want to extend the second partition by 10GB, I will change the Partition Size to 460)

And click ok
Now, right click the partition you want to extend(not the unallocated) and click Move/Resize

Now set Partition Size to the max(click the top arrow next to the white box)Till the blue bar above reaches the end

And you are done.

Ok I just tried EaseUS and it won't let me resize either. And for some reason it's saying C: is unformatted.