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I am confused, so I am also going to use this question to get clarification and fix my computer.
Some background: I had Windows 7 on a 1 TB HDD and decided to partition my hard drive into two ~500 GB partitions, one for Windows 7 and one for Ubuntu or whatever flavour I desired (like a sandbox partition...)
I installed Ubuntu but the installation had issues so I decided to uninstall. Note before the uninstallation I had to press f12 when I turned on to boot from my primary HDD, then choose what OS I wanted to use. Undesirable, but it worked.
Anyway, after I decided to uninstall Ubuntu I went into Windows 7 > Start > Computer > Manage and deleted the EXT4 filesystem (Ubuntu partition) giving me 4xx GB of free space. However when I restarted Windows 7, I am now unable to boot Windows.
When I DON'T hit F12, I see a blank screen with a flashing underscore. When I DO hit F12, I choose my primary HDD, and then I get a GRUB error:
Unknown filesystem: grub rescue> _
Something I'm unclear of: GRUB boots linux partitions, right? What boots Windows? Is GRUB "overwriting" the Windows bootloader? How can I completely get Windows back to normal? (IE, It boots automatically without hitting F12.)
Thanks for any help, I'm on a live CD version of Ubuntu right now until I can get back on Windows.
Just one problem, I don't have an installation disk, the OS came on the computer. – Sam J – 2011-04-03T04:10:21.170
For future reference, you can find a safe win 7 ISO online. See this question: http://superuser.com/questions/78761/where-do-i-download-windows-7-legally-from-microsoft.
– Hennes – 2013-09-02T14:11:41.130