Win XP, Svcs Pk 2, 1.3 GHZ Processor, AMD 64 bit, 2G memory. For some reason I cannot see my Lite-On DVD Rom nor my Plextor DVD Burner in MY COMPUTER. Checked and double checked all connections. All is fine. Tried updating drivers for both, but this cannot be done because the drives cannot be found. Any idea what might be causing this? Thank you. Hennessy.