Stephen,
If your hosting provider has given just moodle 2.2, chances are there PHP and MySQL aren't up to date, however if you want to still try doing manual install then watch these videos, that will help you out. showing both automated and manual install methods, but do have a look at PHP and MySQL version before doing install.
1: http://www.screencast.com/t/7di1TIv9NH
2: http://www.screencast.com/t/isCbx6rnVd
3: http://www.screencast.com/t/QfsROwJCz
4: http://www.screencast.com/t/p59D8pnX8h
5: http://www.screencast.com/t/BKK0rRLd1
6: http://www.screencast.com/t/ZtdiUTSrItGX