Currently Being ModeratedJul 31, 2012 3:39 PM (in response to jletorney)
On reason this could happen is that you have applications installed through the Mac App Store with a different Apple Id. Will continue to ask for that Apple Id until you enter it correctly or uninstall those applications.
As you're seeing this request as soon as you login, the problem must be related to one or more of your startup apps.
Currently Being ModeratedJul 31, 2012 4:06 PM (in response to Therabyte)
The funny thing is that I don't have any startup apps and the account doesn't even log in fully; it is a window in the middle of the screen with the background of the Recovery HD thing or like the backround of the installer during the Mountain Lion installation. Once I click skip or enter credentials, a new message appears with a button at the bottom that says "Start Using Mac." After that the desktop loads with all of my files and the Dock appears and so on...