Thanks, Amogh. As you suggested, I ran the full Diagnostics, and it found no errors. You then stated that I "may" update the system BIOS, but I wasn't sure if you were advising me to do so if no Diagnostics errors were found. I did run the RegEdit program and saw that my SystemBiosDate is 03/29/11 (the download available is dated 04/06/11), and my SystemBiosVersion is "Dell - 6040000 Ver 1.00 BIOS A13 Partial (the download available is A13). Given that information, should I proceed with the system BIOS update via the link you provided? If the answer is "yes", will that wipe out any data I currently have stored on my C:\ drive? Last question: What do you think would be causing my D:\ drive to suddenly disappear? Could that be happening due to a virus? Or any other ideas to the cause? Thanks for your continued help! Mike
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