Windows cannot boot driver letter has changed

[Tofik]

Greetings,

I would be deeply thankful for any guidance on resolving the strange issue:

After a blackout My Dell M6600 laptop cannot boot at all.
I have had a certain Intel messages on missing links, scanning MAC address, etc.

Finally using a repair disk I have found that (I have two drives installed) the boot drive C: has become X: and the other, storage one has taken a letter C:.

I have an acces to cmd via Window 7 repair disk.
Alas I have no idea how to change/revert the boot drive letter to become C: (instead of X.

I will appreciate any helpful suggestions.
Many huge thanks in advance.

Dell M6600 mobile workstation
Windows 7 Pro 64 bit

 

[SIW2]

X: shows as boot because you are booted into windows pe - that is the drive letter it assigns to itself.

That is not connected to the drive letter in the registry of your installed operating system.

You can use this boot media so you will be able to see what you are doing:

32 bit
17514x86.iso


64 bit
17514x64-v9.iso

 

[LMiller7]

The repair disk software has no knowledge of the drive letters as seen by Windows. When you use the repair disk it assigns drives letters to drives for it's own use. These assignments are temporary and have no effect on Windows drive letters.

 

[Megahertz07]

As explained, when you boot from the repair disk it creates a RAM disk (X and install WinPE on it.
Open a CMD window and type
Dir C:
then
Dir D:
Dir E:
...
You will find your disk with windows
Assuming it's E: , Type (replace E: by the drive letter you found typing the dir cmd)
chckdsk E: /f
Reboot and try to boot Windows. If you can't, boot from the repair disk and do a start up repair.