Recovering a deleted Active Directory user account is not an easy task, but it is possible. Here are the steps you should follow:

1. Check your recycle bin to see if the items were moved there instead.
2. Check for backups from the previous day to retrieve the user account.
3. Restore the system state data if available.
4. Check with IT department to see if they have any backups of the deleted account.
5. Once the deleted user account is restored, reset the password.
6. Reconfigure the old access and privileges.