When you try to start iTunes for Windows, you get an error message that says:
The iTunes Library.itl file is locked, on a locked disk, or you do not have write permission for this file.
This happens because, somehow the iTunes Library.itl file got set as read only. You can fix this by doing the following steps:
1. Open the My Documents folder.
2. Open the My Music folder.
3. Open the iTunes folder
4. Right-click the iTunes Library.itl file and select Properties.
5. Uncheck Read-only.
6. If you have a Security tab, select it. Ensure that your account has Full Control permissions to the file. If you don’t have this tab, ignore this step.
7. Click OK.
Now you should be able to start iTunes without the error. If not, your music files may actually be set to where you don’t have proper permissions. Check it with these steps.
1. Navigate to the location where the music files are located. For Windows 7 users, it’s normally in the C:\Users\username\Music\iTunes\iTunes Media folder.
2. Right-click the iTunes Media folder, then select Properties.
3. Ensure that the Hidden and Archive boxes aren’t checked. If you have a permissions tab, check to see that you have it set to “Full Control” and that nothing is set to “Deny”.