no
No you will not lose any data
yes
No, on-line data is synced with the MW3 server. You can even buy a brand new ps3 and as long as you know your account info, your on-line account will remain untouched.
well, if you start a new game and save then you lose your old account, but, if you do NOT save on your new account then you can still play your old one
download the drivers from the Microsoft website
No, you will not lose your account money. The money you register is related to the account, not the actual iTunes software.
you will not lose anything, although in some games you wouldn't start off with the armour you have or weapons etc.
No, you do not lose any characters when you upgrade your account. The only times you lose your characters is if you happen to delete them, or if Blizzard bans your account and deletes them.
In general, IRA accounts are protected from creditors in the event of a civil lawsuit judgment. IRAs have certain legal protections under federal and state laws, although the extent of protection can vary. It's best to consult with a legal professional familiar with the laws in your specific jurisdiction for accurate advice.
No, you are just changing the patently guidance settings.
Well, if you delete your account and wanna re-open it you can! All you have to do is click on "sign up", type in the user name you had along with a password, and you re-made the account. (NOTE: Your account will be back, but you will lose all your data, like friends, subscriptions, videos etc., ALSO if your account was "suspended", you can't re-open it unless YouTube finds out you got "suspended" for no reason they will bring your account with all your data back!)