Log in as Administrator. Right click on the directory that you cannot see. Left click on Properties. Left click on Security. Left click on Advanced. Left click on Owner. Choose a new owner -- Administrator in your case, and then click apply. Click Ok.
Try now to see those directories and files. If it doesn't work, then you should set the security for that directory. But just in case you can't access those files.
From now on it is very simple to gain access to files. Just play with security tab. (Right click on directory, properties, security). If the Security tab does not appear, you have to disable simple security and sharing (or something similar).
