begini gan , laptop gw asus n46vz dapat OS bawaan Windos 8. gw ingin memecah partisi c buat install winows 7. tapi setelah proses memecah partisi berhasil muncul pesan kayak gini saat booting:

The application or operating system couldn't be loaded because a required file is missing or contains errors.

File: \Windows\system32\winload.efi

Error code: 0xc0000225

You'll need to use the recovery tools on your installation media. If you don't have any installation media (like a disc or USB device), contact your system administrator or PC manufacturer.

gimana ini???