Then I went into Device Manager to try and reinstall my mouse drivers, the "Mice & other pointing devices" section was gone. In it's place was an "Other device" with 2 USB "unknown device" items that Windows could not find the right drivers for. There was a keyboard section, and even a "Human Interface Device" section which listed a "Logitech USB Input Device". I right-clicked and had it check for updated drivers...but the most current version was loaded. I'm pretty versed in Windows after 20 years of using platform and even building deployment images for it a while back....but I was baffled. I ended up calling Microsoft support who went through many troubleshooting efforts with me. In the end, I needed to perform a full Windows upgrade to correct the issue.