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Windows V7 Pro will not boor. OS now indicated as being drive d:

Posted on 2014-01-13
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Last Modified: 2014-01-18
We have a windows v7 Pro 64 bit workstation that suddenly will not boot. System repair does not fix it, but I noticed that the windows drive is now know as drive D: and the c drive is called system reserved.

I presume the OS config has got confused along the way, but what do I need to do to recover the config for the OS drive to be known as c: again.

I tried an earlier system restore point, but that did not help.

Any advice would be welcomed.
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Question by:nigelbeatson
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by:Stef95
ID: 39776662
So what the issue sounds like is that bootmgr is missing, this has happened to me in disk management the active partition has been set to D: the way i fixed was a reinstall however check the link :

http://pcsupport.about.com/od/findbyerrormessage/a/bootmgr-is-missing.htm
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by:Stef95
ID: 39776664
Also, have you tried booting into safe mode to do this, if you can get there what you may have to do is go into safe mode with command prompt and try and set C: to active in the list of disks
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by:nigelbeatson
ID: 39776678
can't get into safe mode either. I can get into a command prompt, but how do I set c: to active in the list if disks?
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by:Stef95
ID: 39776684
Please see this link : https://support.microsoft.com/kb/300415

Where was the OS installed on C: or D: which has the system files ?
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Author Comment

by:nigelbeatson
ID: 39776690
the original installation was on drive c: when I boot into the repair mode, the files are all on drive d:. there is also a drive c: but this is labeled as "system reserved" and appears to be empty.

thanks
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Author Comment

by:nigelbeatson
ID: 39776712
you are correct.

when I run diskpart I can see that volume 1 which us c is assigned to system rese and the original boot disk is assigned to d:.
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Author Comment

by:nigelbeatson
ID: 39776753
ok - I have managed to switch the letter assignments using diskpart & assign, but when I re boot the drive letters have switched back again??

help!

many thanks
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Author Comment

by:nigelbeatson
ID: 39776854
when I run bcdedit, the windows boot loader indicates the device with partition=d: and the osdevice with partition=d:

it seems that these have been changed somehow, but how do I fix it?

many thanks
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by:Stef95
ID: 39776984
i think this isn't possible the whole operating system would need to be reinstalled and when reinstalling it, format drive C: and then select it to install on
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Accepted Solution

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nigelbeatson earned 0 total points
ID: 39776989
I have resolved this now thankyou. I was researching this and came across an article which said to check the bios settings.

the sata drive settings were set to IDE and on changing it to ahci, on re boot it fired up perfectly.

many thanks to all.
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by:McKnife
ID: 39780237
Hi.

Next time please provide a proper error description in the first place. The IDE/AHCI issue would have been solved in seconds :)
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Author Comment

by:nigelbeatson
ID: 39780361
I gave all the information available. there was no specific error message. it just failed to boot.
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by:McKnife
ID: 39780389
Ok, if I set my sata controller from AHCI to IDE compatibility mode, then it won't boot but shows a bluescreen (a flashing one). If I chose to hit F8 and select not to restart automatically, I can even read the blue screen contents. For me (as for you) they would have displayed 0x000..7b which indicates the boot device is inaccessible - which would never be seen if the drive letters were mixed up (because at that early stage, letters are not even used).

This should only show you that indeed "all the information available" was nowhere to be seen here. :)
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Author Comment

by:nigelbeatson
ID: 39780621
there was no blue screen just the option to start normally or enter repair mode. thanks for your help.
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by:McKnife
ID: 39780646
***hope you won't call me a smart ass - just meant helpful***
Well, you just did not see the blue screen as the default setting is to auto-restart. As I wrote: you would need to hit F8 to turn auto-restart off in order to see it.
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Author Closing Comment

by:nigelbeatson
ID: 39790464
I accept my own solution as I found the answer elsewhere.

many thanks to all
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