How to fix Windows 7 installation error 0x800f0a12

You can also reset the original active partition to the active state (if necessary) through DISKPA RT until all the SP1 devices are installed.

Most users have transitioned smoothly to SP1, but a small number of users have encountered problems during the upgrade process, which makes the SP1 device impossible. With the official release of win7 SP1.

Among them, a problem that is currently known to be a headache is that the code appears as "0x800F0A 12 error" during the device process. Most of the users who have this error are dual systems, that is, Window7 plus other systems. Br>

The main reason for this error is that the SP1 device determines that the current system partition cannot directly start Window7 and thus interrupts the device. The official explanation given by Microsoft is that the device sequence failed to access the system partition to update the necessary files and the upgrade failed. Br>

You can try the following solutions. If you encounter SP1 device error environment similar to the above situation.

Select storage-disk management, start typing "compmgmt.msc" in the search box to open the computer management interface. Check whether the partition where Window7 is located contains the "active" attribute. If not, right click on the partition and select "Mark partition as active partition"

Set Win7 partition as active partition

Start running The Window7SP1 device sequence is updated directly through the WindowUpdate line, and the computer management window and other application sequences are closed after completion. At this point, this error will no longer appear