Don't use the Update Driver
software function in Device Manager. Go to the website of the manufacturer of the device and download the drivers
from there. If you can't locate them that way (at times modem drivers can be a real pain), then try the Gateway support website.
Download the version there, uninstall the current device, then install the freshly downloaded drivers. Even if you have the most recent drivers you'll still need to do this to remove any corruption that could be occurring.
Driver Verifier does things that stress the drivers - so the behavior of the system may change (as you've seen). Just keep using the system normally until it BSOD's. Most times it'll BSOD with a Driver Verifier error.
If it doesn't (after a day or two), then we'll change some of the settings to see if we can coax it into crashing.