Hello Rolands,
Based on the wireless adapter that your system has we found that the last drivers released for this using is the version 15.8.0 for Windows* 8 which compared to the version previously installed is more recent.
Please access the following link to get the latest drivers for your adapter:
https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=22741&lang=eng
Also, you may want to check the following articles to troubleshoot the problem you are having:
http://www.intel.com/support/wireless/wlan/sb/CS-033854.htm
http://www.intel.com/support/wireless/sb/CS-030709.htm
If the problem persists we would suggest you to contact your laptop manufacturer as you may have a hardware issue as well.
Here’s Dell phone number in case you need it 800-624-9897
Regards,