iTunes, to tell the truth, isnt the greatest software on earth (at least in my opinion)
Other than that:
Your updates are probably security related. It may be a slight security risk to stop installing updates (not a big one, but every few months its a good idea to check for updates to make sure)
(Yes, security updates. That is the only reason I can think of for why they would be weekly.)
Somewhere, there should be a settings/preferences/options area in your menu bar. (
click here to see what a menu bar looks like)
Search your preferences for "Updates" and change how often it checks for them.
