Possibly only reiterating what you already know, but just in case...
It might be worth checking that you really do have have full access and also that the files in question (love Cake BTW) are not marked as Read-Only. For example data files copied from read-only media get given a read-only flag on the writable device. Alternatively moving data on an NTFS drive from one Windows installation to another can create security issues. In order to fix these, however, you first have to be able to find them.
*Missing Security Tab in Windows XP*
If you have Windows XP, and your hard drive is formatted as NTFS, you can set permissions on files so that only users you specify can access them. However, if your Windows XP computer is not part of a Domain on a network, you may notice that there is no Security tab when you right-click a file and choose Properties.
To reveal the Security tab follow these steps:
1. Open Windows Explorer, and choose Folder Options from the Tools menu.
2. On the View tab, scroll to the bottom of the Advanced Settings and clear the check box next to "Use Simple File Sharing."
3. Click OK to apply the change, and you should now have a Security tab when viewing the properties of a file or folder on an NTFS volume.
*Fixing Permissions*
Right-click on your top-level iTunes folder, click Properties. On the General tab clear the Read-only box if checked, then switch to the Security tab. Make sure that your own account (or Everyone) and SYSTEM have Full Control. Apply the changes. If for some reason you are not allowed to apply the change you should be able to use administrator status to take ownership of the folder after which you will be able to modify the security permissions.
tt2
