Hi unDeny,
Thank you for your reply and for providing an update. The list of hardware components provided on the link to install the drivers in the correct order is generic and your system may not have all the components that is listed on the page. Please refine the search by punching in the Service Tag and install the drivers displayed in the correct order.
For the wireless card, please download the driver that lists Dell Wireless 1703 card.
Please let me know if you need further assistance.