Issues installing Windows 7 using Boot Camp - "Error Loading Operating System"

Question

Level 1

8 points

Issues installing Windows 7 using Boot Camp - "Error Loading Operating System"

Hi Everyone:

After scrolling dozens of support threads (am I going to get a response form Loner T?) and youtube videos, I can't seem to figure this out. I have a late 2012 iMac (running HS 10.13.4) and just recently installed a new SSD in place of the SATA. I am trying to get Windows 7 on via Boot Camp (I had it previously), but after the drive is partitioned and the boot camp assistant forces the restart (for installation of W7), I get the "Error loading operating system." error message on an otherwise entirely black/blank screen.

I tried the process a bunch of times - redoing the partition, reinstalling the iso to a flash drive, etc. but I can't seem to get this to start the windows installation for some reason. It seems as if it is having trouble locating the iso installation file as I cannot even get to some sort of installation screen. This happens when I force restart and boot into the usb file with windows.

Any help would be much appreciated! Thank you.

-Scott

Posted on Apr 19, 2018 3:47 AM

Reply

Answer 1

Top-ranking reply

Loner T

Level 9

59,536 points

Apr 19, 2018 2:43 PM in response to sbalterman

Remove all external storage, run SMC and NVRAM Reset, connect the USB2 Installer, reboot and hold Alt/Option. Choose the Windows icon (not EFI Boot) and retry.

I assume you still have the BC partition. If you do not, then run BCA, connect the USB2 Installer, click on Install option and try.

Reply