Dell optiplex 755 running win7-32 Two problems, not sure if they're related 1: Two drivers are missing when viewing device manager, PCI serial port and PCI Simple Communications Controller, I've searched dell's site, and the internet as a whole and have been wholly unable to find the drivers. 2: I'm unable to connect any external hard drives, but any flash drives plugged in will be recognized and accessible by the computer without issue. Any help would be appreciated.