Ok, It's my fault because I upgrade my Pc too often and forget to deauthorise itunes on it, but is there any way to "fool" the application or get round this? I'm on my 6th PC and won't let me authorise it.

Thanks

Have you tried reseting your authorisation count by clicking Deauthorize All in the Account Information screen?

Don't know where to find that, as only option is to deauthorisde this audible account. Not even sure what any of this means.

Under the store menu
Deauthorise computer

Google is your friend:
http://www.macworld.com/article/4919...authorall.html

First result for "itunes deauthorize all computers"... surprisingly.