Can I deauthorize all computers on iTunes, without being on an authorized computer? I'm having issues installing apps on my new iPhone, because I am not authorized on my computer.
In the last 8 years I've been changing computers and reset the OS a lot. I didn't think of a limit with authorized PCs on iTunes.

Now I can't authorize my current system, because I do not have access to the "authorized" computers (i.e. the old OS I formatted).

How can I remove all the authorizations at once? I know I can only do that on an authorized machine (which I won't ever have access again).
Do I need to ask Apple directly for support?
I solved it myself.

For reference here's the steps I followed.

On the iTunes menu open Store->View Account, then in Account Summary click "Deauthorize all computer/devices/whatever.." (I'm translating in english the steps)

I wasn't able to do this on the menu with Store->Remove Authorization, because it was asking me to be authorized first to do it (and I already had 5 authorized computers).