Windows Explorer is almost certainly there otherwise Windows would be giving you problems. Look under All Programs - Accessories and you should see Windows Explorer listed.
IE is ready too. Open Control Panel, Programs, Programs and Features, the Turn Windows Features on and off. There you should find Internet Explorer listed put a tick in the check box by it and then click OK. You will then need to make IE the default browser but lets deal with that when IE is available. It should be IE11 but you may need to run Windows Updates.