I'm running a genuine Windows 7 Ultimate x64 my AMD based system. I triple boot Win 7, OS X & Ubuntu on the same system using Charmeleon bootloader and I believe that may be the culprit here. Error 0x800f0a12 states that Windows 7 cannot access this special 200MB partition. I've formatted my system dozens of times using non-Windows based partition utilities and I've never come across this partition. I've tried enabling automount & restarting so that maybe it would mount the partition and continue but no avail so far. Got any suggestions? I guess I could create a backup of my Ubuntu & OS X partitions & use the standard Win 7 bootloader and then erase them until the the update is complete. Then once completed, reapply the backups to the harddrive. Updates: So far the update is stuck 0% download but my internet connection is live... Decided to download it manually from Microsoft.