A disk read error occurred

Good, use it to remove your Windows partition and start again. Do you have backups of any data you may need on the Windows partition?

And do you have a backup of the OSX partition?

If not, make backups before you start.

I think Csound1 is telling you, rightly so, to read the documentation then follow the indtructions for removing Windows. Obviously you went wrong during your initial attempt at installing Windows. Then, after you have read and understand the instructions in the documentation, start your Windows install again. Follow the instructions.

Julietomato wrote:

I did it.Now only Mac is available in the boot manager.

Good, so you now have one partition. Run Boot Camp Assistant (BCA) again and reinstall Windows, read all the instructions carefully and verify that your backup is current before you start.

Reboot, hold the option key at the sound of the chime, what is available in the boot manager?

Julietomato wrote:

How to remove Windows partition?

Read the Boot Camp documentation, it is time.

As I said, you should read the documentation provided in Boot Camp Assistant before proceeding.

Is this a disc that you made, or bought?