It's not intuitive, but you can get access to ANY folder. You just need to give yourself ownership first.
Open a Windows Explorer window, navigate to the directory, right click on the it, select Properties, go to the resulting Security tab, and click the Advanced button contained there.
Click Edit, select "Administrators" from the list of potential owners, click the Replace owner on subcontainer and objects checkbox, then click the OK button.
After a couple minutes you'll be presented with a Window informing you that you need to close all property dialogs for the ownership changes to be visible. Follow this advice by clicking the OK button in the File Properties window and you should now be back at the Windows Explorer window you originally opened.
Right Click on the directory again and select Properties one additional time. Go to the Security tab, and click the Advanced button again also.
Click the Add.. button in the Permissions tab, type in Administrators as the name (ensure your Local Computer domain is selected), and select Full control from the list of available permissions. Click OK out of the Permission Entry dialog, select Replace all existing inheritable permissions on all descendants... then click OK from the Advanced dialog.
After a couple minutes you should once again be back at the File Properties dialog. Feel free to click OK and close Windows Explorer.