I've seen a few posts and some solutions to a similar problem where the driver signing was the issue. My problem has similar symptoms but is not a result of signing and can't be fixed by deleting the filter keys in registry. symptoms: new Acer Netbook. New LG External Super Multi DVD Rewriter (GP08). Plug in USB drive, but windows 7 declares a problem with recognizing the drive. (Same drive is immediately recognized by XP laptop, loads drivers, so the drive is okay - problem is with windows 7) In device manager, a yellow exclamation mark shows beside a USB unknown device. I've tried uninstalling, restarting etc., but to no avail. Has anyone else experienced this problem (which is not solvable by removing filter keys for CDROM class in HKLM)? My conclusion so far is that windows 7 just doesn't have the device/manufacturer id in its driver database so it doesn't know to load the DVD/CDROM drivers....but if that's the case, how do I manually tell windows which drivers to use?