Windows 7: Can't boot to c:

Computer crashed at midnight on thursday & rebooted into repair, which it failed as well failed at system restore & just kept looping to repair.
Discovered that all the drive letters have changed,

I: dvd rom >> should be x:dvd rom

drive 0
c: system rese >> should be no drive letter
g: Windows 7 >> should be c:Windows 7
e:apps >> should be d:apps

drive 1
d:fsx >> should be f:fsx
h:storage >> should be s: storage
f:games >> should be g: games

How do I change the drive letters back from the rescue promt command line, to be able to boot to c: Windows 7 ?????

Thanks Rick

Do a Strartup Repair:
Startup Repair
Note: You may need to do startup repair 3 to 4 times.
Startup Repair - Run 3 Separate Times

You don't need to change the drive letters.

They just look different from the recovery environment - that is normal.

Thank you for the reply.

disconnected all USB devices & rebooted 5 times from repair .... no luck.

note found an error .... boot critical file G:\CI.dll is corrupt.

I wrote this down yesterday & forgot about it .... any help?

If you are able to get to advanced boot menu, try Last Known Good.

Otherwise, try a system restore from the recovery disc.

This is how to get in the last known good configuration : Advanced Boot Options

when I press the F8 key it does not take me to advanced boot ... but to a list of my dvd & 2 hard drives , no other option.