I am using Windows 7 Professional and want to be able to track who is logging in to the PC and when. I have turned on audit logon events in the Group Policy Editor and it's logging events. However when I check the security log with the event viewer I can't get the user column to display any user names. They are either blank or have N/A in it.

Can anyone give me any tips on how to get the user names to display in the user column when using the security log to check who has been logging into a PC?