With Windows 8 (and presumably Window 7 too) you can create a Scheduled Task.

1. Open Task Scheduler

2. Create a Task (not the basic one)

3. In the Triggers tab create a new trigger select At Log On, the specified user and add a delay of 1 minute

4. In the action tab create a new action that launch Steam.exe

5. Check if other default settings are ok for your environment and save it.

   

With Windows 8 (and presumably Windows 7 too) you can create a Scheduled Task.

1. Open Task Scheduler

2. Create a Task (not the basic one)

3. In the Triggers tab create a new trigger select At Log On, the specified user and add a delay of 1 minute

4. In the action tab create a new action that launch Steam.exe

5. Check if other default settings are ok for your environment and save it.