I want to schedule my desk cleanup to run once a week. When I go to the Schedule Task Wizard it eventually asks me for my password. My computer to my knowledge doesn’t have a password. (When I turn the computer on it doesn’t ask for a password and this is the only time it’s ever asked me for a password.) So, I just click next, but then I get this error:

“An error has occurred while attempting to set task account information. The specific error is: 0x8007005: Access denied. You do not have permission to perform the requested operation.

What do I have to do to get the disk cleanup to run as a scheduled task? Alternatively, how can I reset my password or figure out what it is?