How to use the old partition

As in my previous post here http://www.mac-forums.com/running-windows-or-anything-else-on-your-mac/339859-increasing-bootcamp-partition-size.html I tried increasing the partition size but i ended up messing it up. I reinstalled mac os x and i checked and i still have my windows partition. Is there a way to continue using this partition? Bootcamp assistant tells me i need a single volume so I cant do anything with my old partition that way. It doesn't recognize the partition anymore. I tried restarting into the windows partition via disk management but it just loads up the apple way and shows the prohibited sign. I have to select my untitled partition (where i reinstalled os x on) to be able to get back to my Mac. If i can't use it how can I delete it and merge it back into a single volume?

Olay Rummyyyy, go into Disk Utility and th e Partition section.

See the rectangle showing blue and white squares? Lower right corner drag the line down to the bottom and this should increase the size of the drive to its original.

Keep us posted?

harryb2448 said:

Olay Rummyyyy, go into Disk Utility and th e Partition section.

See the rectangle showing blue and white squares? Lower right corner drag the line down to the bottom and this should increase the size of the drive to its original.

Keep us posted?

Click to expand...

Yeah that worked thanks! It's back to original. I'm just redownloading Windows iso again and ill let you know if it successfully installs bootcamp again.

harryb2448 said:

Olay Rummyyyy, go into Disk Utility and th e Partition section.

See the rectangle showing blue and white squares? Lower right corner drag the line down to the bottom and this should increase the size of the drive to its original.

Keep us posted?

Click to expand...

@harryb2448
I tried to install bootcamp but it still gave me that same error about needing one single partition https://puu.sh/uJ5g5/4112e2106a.png. I tried restarting my mac but then the prohibited sign came up again. Then i restart again and hold the option key and it shows me this screen:
https://puu.sh/uJ4Xx/61f4de5deb.png
clicking mac os x (which i renamed from untitled to that after i reinstalled mac) will take me to my mac but the two others dont work they just show the prohibited sign.
I'm thinking I have some hidden partitions or something because in my previous thread when i was trying to expand the partition I saw other partitions that I don't see on Disk utility but I do see on windows disk manager
https://puu.sh/uDv1U/56d9ae902a.png << this is from my previous thread.

EDIT: I read on a thread that I should merge the partitions so they can become one
https://discussions.apple.com/thread/6586339 If you click view all replies u will see what im talking about. My diskutil list shows the same as that guy but my order is switched. I tried doing the merge but it just showed me information http://puu.sh/uJ6Ra/f0140b098b.jpg so i tried doing what the example said to do and this happened: http://puu.sh/uJ7qb/d42ade1410.jpg

This is what i see when I do diskutil list
http://puu.sh/uJ5K8/899ede2ff5.jpg

Solved!
Check this thread to see how I solved it thanks to @LonerT
https://discussions.apple.com/thread/7890872

It's pretty straightforward but if you need any help you can just PM me or something.