In Windows 7, by default permission level for C drive or the drive the operating system is installed is set to READ only as Windows 7 prohibits sharing of Windows folder, Program Files folder, and Users folder(other than Users\Public).
To share the root of a drive, do the following:
1. Right-click the C Drive and then click Properties.
2. Click the Security tab.
3. Click Advanced, and then click the Owner tab.
4. In the Name list, click your user name, or click Administrator if you are logged in as Administrator, or click the Administrators group.
5. Click on Edit and then put a check mark against "Replace all existing inheritable permissions on all...