No solutions to offer but I have exactly the same problem with my Dell desktop running Windows 7. I've had so many problems with Internet Explorer that I use Firefox most of the time. I did switch back to Internet Explorer not long before my 2nd episode of losing my internet connection and then switched back to Firefox again the day before I lost internet connection. The last thing I did the night before I lost connection this second time was to run Malwarebytes and remove two unwanted programs: Optional.Conduit.A and Optional.ValueApps.A. Then I shut the computer down (last night) and when I turned it on this morning it had lost connection. My newer Samsung desk top, my wife's Dell laptop and her iPhone, and my grandkid's Wii are all still connected. The computer that's down is the only wired connection (it sits right next to the modem) but that's not the problem--I replaced the cable the first time this happened even though it wasn't defective and I tried wireless to no avail. The computer can't seem to find its internet connection hardware--like it has no driver. I haven't restored to a prior date yet this time---I did that last time and at first it didn't seem to work-- which is why I bought the new Samsung. A couple of days later, the lost-connection Dell desktop computer all of a sudden seemed to finish the restore (not sure about why it finished two days later--I thought it was finished days before when first did the restore) and I could once again connect to the internet. The internet connection was the only problem--everything else worked fine (i.e., no more screwed up than normal), before, during and after the internet loss.