Q: Partition Problem can't remove Partitions (Tried Everything.)

So I've been trying to BootCamp my Windows 8.1 Pro x64.

But when i came to the install section where i choose and partition, and of course I choose the bootcamp partition.

But somehow it did not work, so i just restarted and went back to yosemite.

And I opened up my disk utility, and saw there was created different partitions,

like diks02s, disk03s and so on.

And when i press the minus button it won't get removed, and message comes up.

Partition failed with the error:

The requested size change for the target disk or a related disk is too small. Please try a different disk or partition, or make a larger change.

So il try to resize, some hundreds mb, which does not work, when il try to resize, it just won't it is preparing to resize for hours even thought we are talking about 200mb resize here, i waited and waited for like 6 hours and it did not resize.

So i thought to get to the boot area (Like when you restart and hold in Command + R) and resize from there, it worked! But for like an half hour, before the same message came up :

Partition failed with the error:

The requested size change for the target disk or a related disk is too small. Please try a different disk or partition, or make a larger change.

And yes I've been trying to resize from the boot area.

Nothing works!

Mac information if needed :

Mac Pro (Late 2013)

Processor 3.7Ghz Quad Core Intel Xeon E5

Memory 12 GB 1866 MHz DDR5 ECC

Graphics : AMD FirePro D300 2048MB

  Model Name: M