Unused disk space


New Member
I'm new to Eraser. I have it set up and it works fine on my trash bin.
But when I try to clean the unused disk space I get a message that says: Session: Tuesday, August 20, 2013 4:33:20 PM
Tuesday, August 20, 2013 4:33:20 PM Error The program does not have the required permissions to erase the unused space on disk. Run the program as an administrator and retry the operation.

I'm using Win7 pro. And I'm shown as the administrator. However I don't share the computer with anyone.
And I never set up a password. Could that be the problem?
I'm lost and could sure use some space