Check the XP Users Accounts in Control Panel (You are on XP?)
See if you are listed as an Administrator.
If not .. and there is another administrator account available, log back in onto that one
Hopefully it is not passworded (as you would need it if it is)
when we double click on icons instead of opening up a box appears and says open with ... (what programe) so we open it up as run as then it comes up with which user account do u want to use this programe defaulting on current user (admin) thats as far as we can go, it says we are not the administrator