I upgraded BIOS on a Dell XPS 8500 (running 8.1) to A12. A few days later (maybe unrelated) started getting system slowdown and pauses where HD light just stayed on and system did nothing. Ran chkdsk and fixed errors, only to have it happen again several more times. Worm or virus, maybe? Finally, system crashed and wouldn't reboot or restore. Went in through DOS, and it looks like partition info might be corrupted, because data appears spread across incorrect drives. Now for the fun: I had the original drive that came with the system (can't remember whether it has 8 or 8.1 upgrade on it), so I disconnected the failed one and tried to boot the old one. Got a blank screen. Need some serious help here, please! Haven't tried to refresh yet, because I'd like to avoid losing programs and settings, if there's a way to salvage the drive. Looking into partition restoration software, etc. Anyone have any experience with this? I saw a similar post and added a reply to it, but figured it might make more sense to start fresh with a new post. Thanks!