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Windows 7: Accidentally formatted UEFI System Partition, now Windows won't boot.

19 Jul 2013   #11

Microsoft Community Contributor Award Recipient


Quote   Quote: Originally Posted by epic93 View Post
I'm having trouble downloading it from that site, are there any mirrors or torrents (of THAT EXACT ISO, not pirated/cracked copy)?
If you can not download the ISO, order the official ASUS Recovery DVD.

You can Order ASUS recovery disks from here:
Essentio Recovery Software

My System SpecsSystem Spec
19 Jul 2013   #12

Windows 7 Home Premium 64 bit

Thanks for all your help, guys!

That things operational!

In case anyone else makes a similar mistake to what I did...
Problem: Formatted UEFI/EFI System Partition as something else

Solution (only valid for 64 bit Windows as 32 bit does not use UEFI as far as I know)
Download Windows 7 image from this page. Download this ISO if you were using Windows 7 Home Premium like I was.

When I tried to download it with Chrome, that didn't work. I used firefox to download it successfully, but your experience may be different. If it isn't 3.1 GB after you've downloaded it, try a different browser!

Write that ISO to a usb drive with RUFUS (make sure that partition scheme and target system type is set to "gpt partition scheme for UEFI computer")

Boot from that USB

Once it's booted it'll have a language choice. Click Next.

Click on Repair.

Now, it'll suggest a repair for you. Cancel that and click on Startup Repair.

And there you go, it'll fix that UEFI/EFI System partition and get you booting again!
My System SpecsSystem Spec
19 Jul 2013   #13
Microsoft MVP


That's the exact thing I suggested above:

Quote   Quote: Originally Posted by gregrocker View Post
I would boot the flash stick installer or DVD created from Win7 Home Premium x64 SP1 English Official ISO download to try running Startup Repair.
Did you have to pre-format the UEFI boot partition you deleted too as I also suggested?

Quote   Quote: Originally Posted by gregrocker View Post
Recreate the partition NTFS Primary first to see if the repair utility will rewrite the UEFI boot partition. Let us know how this works.
Thanks for confirming this as well:

Quote   Quote: Originally Posted by gregrocker View Post
It's not correct that Win7 will not repair from a flash stick. I've done it many times.
My System SpecsSystem Spec

02 Feb 2014   #14

Windows 7 Home Premium 64

I know it's been awhile since anyone posted on this thread but I had to say "thank you sooooo much!! I've been working on this problem for a couple of days now and I just came across this solution a little over an hour ago and now my problem is solved.
My System SpecsSystem Spec

 Accidentally formatted UEFI System Partition, now Windows won't boot.

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