A 150-pound person will burn 476 calories per hour during Walking up stairs, using or climbing up ladder, see CalorieLab to customize.
Dell Latitude E4300 Wireless Switch. So for everybody with the same problem, here comes the solution, on the Dell Latitude E4300, the wireless switch is located on the right side of the laptop, just under the only USB port of the machine. See picture of the Wireless Switch below:
For more specific troubleshooting information, please see Lenovo's documentation (here). On newer Thinkpad laptops there is a hardware switch used to enable and disable wireless networking on the laptop. Slide the switch to your right to enable wireless networking, and slide it to your left to disable it.