He could also make grub his first bootloader and set it to chainload windows bootmanager.But if he had use wubi for virtual installation the only solution would be to setup windows bootmanager.

I don't realy understand what you have done.
As you said you have create a new partition in order to install ubuntu (you probably have create a swap partition too).
Those actions are telling me you...

At first you are going to need an other partition or hard disk in order to install an other version of windows.
So if you have not a second (internal) hard disk you have to resize the partition you...

One solution is if we use a different partition for every windows installation so we can avoid conflictions.
But my main problem is I already have 2 partitions (ext4) for linux distributions and 1...

I know all of those things.You are missing the point.I can boot my Windows 10 Setup if I want without problems.I can also create an AIO installer with both (home and pro) editions if I want.I could...

If you cannot find the drive C: could mean your partition is destroyed.If this happens you can try to run a chkdsk to the specific partition.
For this step you have to use diskpart to assign your...

I didn't totally understand the issue.I am a little confussed about how did you make the partition proccess because C: drive shouldn't be your boot partition (actually it shouldn't have some letter)....

The answer here is very simple.You have deleted your boot partition so I guess the partitioning proccess has been made well.
The solution here is to rewrite the bootloader files to your OS partition...

I have download windows 10 pro and home editions with both 32 and 64 bit versions of the os by using media creation tool.I have make bootable my external hard disk by using bootsect.exe and I have...