Accessing the "Application Data" folder in my user account?

I need to access the Ap data folder in my user account which has full control
priv's. When clicking the folder It gives me an access denied pop-up with a
button to edit the secutity settings. What's the story? Every thing I've
tried with the security dialogs end up with an "error" message, stating that
it failed, and a registry entry corrupt warning that disables the registry
key?. I installed a program that wrote files to the folder, but failed to
actually install, so I either want to delete the files or see if I can get
the programs' intall routine to run. Anybody else run into this? The "user"
account shows all of the boxes checked except the last one which is labled
"apecial permission" and I go to the advanced button to check it's settings
out and all of the boxes ar checked off there. Any comments or help will
be appreciated.

Barefoot