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Windows 7 randomly freezes on some HP 400 Pro One

We have about 100 HP 400 Pro One installed and a very few (like six or eight of them) experience system freezes so hard we have to reboot them, and we are at a lose of what's causing it. The ...
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WIA device is not online error (scanner, all in one)

I have an all in one epson scanner. For some reason, in the middle of scanning a page, after many pages have been scanned, the scanner fails and this error "WIA device is not online" pops up. ...