Unless the tech downloaded some driver or program to your computer, which I doubt, this almost assuredly has nothing to do with your HughesNet upgrade.
I'd recommend saving any important files to an external drive, if you're able, then reinstalling the operating system. I'd also recommend downloading drivers from the manufacturer before you do this, so that you have them if you need them. If they don't offer them anymore, save the 'DriverStore' folder from C:\Windows\System32\DriverStore. It'll likely be anywhere from 2GB to about 6GB or so in size. Again, this way you have drivers for after the OS install if you need them.
Edit: Though I can't read what the screen is indicating the problem is being caused by, including the code if there is one, you may want to reseat both the storage and the RAM while the unit is off and completely de-powered (after the power (and everything else) is disconnected, press the power button to dissipate any residual power within the unit). If it's a laptop rather than a desktop and it has a built in battery, de-powering is more involved (detaching the power cable inside the unit).