Eto pa kung ayaw hung una...
2. Partition not set as active.
This error will also appear if your primary partition is no longer set as 'active'. To set the primary partition as active, you need to use diskpart to run the necessary commands for this.
If you have the original Windows installation media, you can use that media:
a. Insert the Windows installation CD/DVD or USB and boot from that.
b. At System Recovery Options or the Troubleshoot, click Command Prompt.
c. Now type: "diskpart" (without the quotes) and press "Enter".
d. Next type: "select disk 0" (again without the quotes) and press "Enter".
NOTE: Where 0 is the disk’s number where your Windows is installed on. For a full list of disks that are available on your computer, type "list disk" (without the quotes).
e. Now you want to type: "list partition" (yes, without the quotes) and hit "Enter".
f. Here you will type in: "select partition 1" (you guessed it, without the quotes) and hit "Enter".
NOTE: Where 1 is your primary partition.
g. Finaly type: "active" (no quotes) and hit "Enter".
This should resolve the problem.
NOTE: If you don’t have the original installation media, you will need "Easy Recover Essentials" and run the fixes from the Command Prompt.