MacOS – Booting into Windows gives “Operating System not found”

bootcampmacos

I just upgraded my Macbook Pro from Snow Leopard to Lion, and now when I boot into Window 7 using Bootcamp I get the error "Operating System not found."

Following the advice at http://reviews.cnet.com/8301-13727_7-20090187-263/boot-camp-partitions-not-working-after-installing-os-x-lion/,
I found that I had MacFUSE installed, so I uninstalled it. The problem still persists.

That article also suggests the possibility that there could be too many partitions on my drive, but Disk Utility says there are only two: Bootcamp and my OSX partition.

I can still access the files on my Windows partition through Finder.

Does anyone know how to fix this problem?

Best Answer

Try to repair the Windows boot sector using the Startup Repair Tool by Microsoft.

You can attempt a Startup Repair using these instructions:

  1. Insert the Windows 7 installation disc or USB flash drive, or a system repair disc, and then shut down your computer.

  2. Restart your computer using the computer's power button.

  3. When prompted, press any key, and then follow the instructions that appear.

  4. On the Install Windows page, or on the System Recovery Options page, choose your language and other preferences, and then click Next.

  5. If you are using the Windows installation disc or USB flash drive, click Repair your computer.

  6. Select the Windows installation you want to repair, and then click Next.

  7. On the System Recovery Options menu, click Startup Repair.

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