Cannot purchase on itunes, keeps asking for password even though it is the correct one. Can log in and out of the itunes account but no purchase ability don't want to keep changing password for no reason.

Try going to iTunes>Preferences>Advanced, and click on the "Reset Warnings" and "Reset Cache" options, then try again.

Cheers,

GB

Is your Mac Authorized to your iTunes ID? Without being signed into the iTunes Store, click on the Store Menu option at the top. Then Click on Authorize This Computer. It will ask for your Apple ID and password. Type those in and see if that works. If it does, then try signing into iTunes and making purchases.

Cheers,

GB

OK, one more place to try - Click on your name in iTunes, and then click on Account Info. Type in your password, then when the Account Info screen displays, scroll to the bottom and click on the Reset all Warnings for Buying and Downloading:

Cheers,

GB