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Windows 7: Broke my Windows by activating a partition :(

17 Apr 2011   #1
Arm4L1t3

Windows 7 Home Premium x64
 
 
Broke my Windows by activating a partition :(

hi guys, I was just trying out some stuff with the disc management, and I activated a partition that didn't have the OS, I don't think. So now when I boot up on that computer it says "bootmgr is missing". BIOs won't let me change the place it boots from either. I also tried putting Windows 7 on an external hard drive and booting from that. Can anyone help me? Also, I have a laptop with no CD drive, and I can get one, but I would prefer if there was a solution without having to buy one.


My System SpecsSystem Spec
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17 Apr 2011   #2
MacGyvr

Windows 7 Ultimate RTM (Technet)
 
 

Download GParted (free) and boot on it. Remove the active flag from the partition you activated. That should fix it.
My System SpecsSystem Spec
17 Apr 2011   #3
Arm4L1t3

Windows 7 Home Premium x64
 
 

Thanks for the quick response.
So I can boot off it even if bootmgr from Windows is missing? Also would I have to format the external hard drive/flash drive I'm going to use?
My System SpecsSystem Spec
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17 Apr 2011   #4
MacGyvr

Windows 7 Ultimate RTM (Technet)
 
 

GParted is just a partition editor/manager. It should help you undo what you did.
My System SpecsSystem Spec
17 Apr 2011   #5
SIW2

Microsoft Community Contributor Award Recipient

Vista x64 / 7 X64
 
 

You will need to ensure the original system partition is marked active.

If you have a 100mb partition - that will be it.

If you don't, then it is either your main windows partition, or possibly the oem recovery partition ( if you have one )
My System SpecsSystem Spec
18 Apr 2011   #6
wilywombat

win7
 
 

Welcome to the forums, you could try booting from your installation dvd and carrying out a "startup repair" details from here:-
Startup Repair
My System SpecsSystem Spec
18 Apr 2011   #7
Arm4L1t3

Windows 7 Home Premium x64
 
 

Er, can someone teach me how to use it? I downloaded the one at Sourceforge, is that right?
My System SpecsSystem Spec
18 Apr 2011   #8
wilywombat

win7
 
 

Suggest you try the "startup repair".....
My System SpecsSystem Spec
18 Apr 2011   #9
Arm4L1t3

Windows 7 Home Premium x64
 
 

There is no startup repair, it loads up, then it says bootmgr is missing. And I have no CD drive.

Edit: And how can I make the makeboot.bat boot from an external hard drive?
Edit again: GParted says it only works on x86 machines, but I have 64x. Will it still work?
My System SpecsSystem Spec
18 Apr 2011   #10
wilywombat

win7
 
 

That would depend on you having a mobo that can boot from USB (check your BIOS) and it would probably be better to make a flash drive bootable and put your file on that.
My System SpecsSystem Spec
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 Broke my Windows by activating a partition :(




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