Driver_IRQL_NOT_LESS_OR_EQUAL started after AT&T "fixed" my internet

Hi y'all,

I've been using my 2010 Dell Precision M4500 laptop to run all sorts of architecture-related programs for the past two years without any BSODs: AutoCAD, REVIT, sketchup, Adobe suite, never had any problems.

Two weeks ago, AT&T had to replace my modem/wireless router combo, as it had died. Since then, I've had three BSODs, all with the same error message: "Driver_IRQL_NOT_LESS_OR_EQUAL". They've all happened while I've been using Firefox, without any other programs open, except possibly windows explorer.

It may just be a coincidence that it started at the same time that I switched from using a wireless router to a plugged-in modem. Frankly, I don't know enough about computers to have an opinion.

Any help I could get would be much appreciated!