Hi Diana Rumelhart,
I would suggest you to run complete windows update and then uninstall and re install the wireless drivers. Please ensure to update the system BIOS after re installing the wireless drivers. You may download and install the latest wireless drivers and BIOS from the link below:
On the link, enter the system Service Tag and click on ‘Continue’. Select the operating system and it will display a list of available downloads. From the list select the applicable option. Click ‘Download File’ and follow the on screen instructions.
Note: Before updating BIOS please ensure that:
*Battery is 10%> charged
*Battery charger should be connected
Hope this helps. Please reply if you have any other questions.