Windows 7 will not boot as drive letter changed from C: to E:

Hi support/helpers

My laptop was booting, but got locked up at one point, well it was not doing anything and seemed to be stuck. Maybe I should have left it a little longer to see if it sorted itself out but I didn't. I held the on/off button down to do a "hard restart". In hind site a dumb thing to do but you can only stare at screen for so long and move a mouse backward and forward with nothing else happening.

The laptop will now not boot, it goes into repair mode but cannot solve anything. It gives me an option to go to the C: prompt in repair mode, which I can do.

The Problem:
my original C: drive is now my E: drive, my D: drive is now my C: drive, my E: drive is now my D: drive.
Everything seems to be ok folders and files etc. just the drive letters messed up.

I guess I corrupted something. Is there a way of getting the drive letters corrected so I can boot into windows?

Information:
I cannot press F8 to get to safe mode etc.
In the bios my hard drive is seen and is the first boot drive
My hard drive does have 3 partitions, originally c,d, e. C was where windows 7 was installed too.
I see a recovery folder but dated 2009 and to scared to use it as so old, not that I know how to use it.

Any help would be appreciated, hoping for a simple free utility I can download to sort it all out.

Andy

Thanks for trying to help.
I am not sure if it is windows changing the drive letters or the partitioning part of the boot process. I can't see how it is the initial boot as drive 0 has always been the C: drive. I can only think that some part of the system registry has gone corrupt and reassign the drives. Really I am at a loss of what to do. I was thinking of making a boot flash drive just to see if my drive C is still my original drive C. This would prove that Windows is changing the drive letters. But from there I would not know what to do.

The drive letters are often different in the repair mode (WinRE) so that is nothing to be concerned about since the OS will not change drive letters except in a very rare case of failed imaging which I haven't seen in years here.

So you'd follow Troubleshooting Windows 7 Failure to Start which includes everything that's possible to start the OS, leading up to if necessary rescuiing your files to run Factory Recovery or do the superior Clean Reinstall Windows 7.

Thanks will read the articles. Have a feeling a reinstall will be required. I am hoping it will come up and say install or repair. I guess I am lucky I can still get to my data.
I was hoping on something simple but that is disappearing fast.