From the screenshot you have provided I have a question - is your computer name - unknown?
The reason I ask this is that the user groups are shown with that as part of that context as system name, (eg unknown\administrators), if your pc is not named unknown then there are serious permissions issues with this drive.
This may be due to the drive not being online during the OS upgrade
To work around these issues you are best enabling the "Hidden Administrator" account.
http://www.sevenforums.com/tutorials/507-built-administrator-account-enable-disable.html
When this is done you should be able to completely reset the drives permissions
These following instructions should clear all existing permissions and reset to a working condition.
log on as the Hidden Administrator and perform the steps for taking ownership.
Once you have ownership of the complete drive.
follow the steps to open the advanced security dialogue and click the change permissions button
uncheck the "include inheritable permissions ..." checkbox and when prompted click "remove"
REMOVE ALL PERMISSIONS - (highlight each user/group and click remove)
Add "administrators" - Full Control
Add "Zak&Jamie" - Full Control (assume this is username you are using)
Click on the "replace all child object permissions with inheritable permissiona from this object"
Click apply (wait for application of permissions)
OK out of the dialogues
Note: You may have to perform this action more than once to ensure that all permissions are reset completely.
To check this is working correctly you may want to perform these steps on a single sub folder on the drive - and then try saving a file there
Log out and back in as your normal user and disable the Hidden Administrator account