Help!: The iphone cannot be synced. You do not have the privilege to make changes

[Dominic87]

Help!

I synced my iphone4 to a window PC before i get a mac recently.

So, when i try to sync my iphone 4 to mac.
I was told that "the iphone cannot be synced. You do not have the privilege to make changes".

1. i clicked store> authorize this computer. =failed.
2. restart mac. =failed.
3. reinstalled itunes. = failed.
4. restored iphone4. =failed.

So, what else can i do?
is there any solution?

 

[b0blndsy]

Are you loged in to you administrator account?
Do you have read/write permission to itunes folder

 

[Dominic87]

Are you loged in to you administrator account?
Do you have read/write permission to itunes folder

Thansks for helping

I do logged in as admin.
I changed all the related folders' sharing/permissions to "read & write" for admin, me and everyone.

But still cannot be snyced for the music and photos.

 

[b0blndsy]

Dammn can't say what to do now ?