Go to Itunes, then click on "Edit", and then "preferences". Under the tab labeled, "General", make sure the box next to "show podcasts" isn't unchecked, that may be why you cant subscribe to anything. Check it off, and you should be good to go. If that doesn't work, look under the tab "parental controls", and make sure the box isn't checked for "disable podcasts".
Hope that helps!
Dell Windows XP