Various solutions to remove booting errors:
Verify the Computer Finishes Initial Power-Up (POST)
Unplug All External Devices
Check for Specific Error Messages
Reset the BIOS to Default Values
Run a Computer Diagnostic
Check Dell Optiplex 780 Manual for more solutions.
May be there is problem in your laptop like you are using wrong drivers or drivers get corrupted by malware. Thus to fix it delete old one and install new one. There is nothing wrong with any other stuff except laptop. If your are using access point then turn off it for at least 1 minute and try connecting again.If still issue exits then check Dell Latitude E4310 Manual for more troubleshooting suggestions.