This is the problem , I had Itunes installed on my computer in hard drive C , and my "My Music" folder (which I didn't even used) was on my D hard drive.
My D hard drive stopped working for some reason and I had to take it out. Now when I try to start Itunes a message appears that says: - The folder "iTunes" cannot be found or created, and is required. The default location for this folder is inside "My Music" folder. - And it doesn't start.
I tried installing it again but the same message appears. Their must be a file somewhere that says that this folder should be on that hard disk or something.
What can I do?