No logs in Security Event Viewer

You need to open up User Manager->Policies->Audit and check "Audit these events" and select the items to audit, eg, Logon and Logoff, check both 'Success' and 'Failure'. You will then see events in your security log.

Nothing is wrong. You just don't have any security items being audited.

You can enable auditing through User Manager-->Policies-->Audit. In the window that opens, you can choose which events you wish to audit.

The above answers are correct. But there is another item you need to consider. If the computer is a PDC or BDC, the above info will work fine. But if the system is a member server, or workstation, you will need to adjust one item.
Open the User Manager. From the file menu, select 'domain'. In the box that opens up, type the name of the computer you are at. This changes the user manager from the domain level to the user manager of the computer you are seeking to audit. Then, follow the above steps.

Hope this helps.

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