[SOLVED] Startup Repair cannot repair this computer automatically.

Hi all.

Tried to boot up my computer this morning and was given the message: 'Startup Repair cannot repair this computer automatically.'

Problem signature:
Problem Event Name: StartupRepairOffline
Problem Signature 01: 6.1.7600.16385
Problem Signature 02: 6.1.7600.16385
Problem Signature 03: unknown
Problem Signature 04: 21200400
Problem Signature 05: AutoFailover
Problem Signature 06: 13
Problem Signature 07: CorruptFile
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 1033

I'm running Windows 7 Professional, installed onto a Crucial M4 SSD.
It won't let me boot in safe mode, and gives the same message.
I have no system restore points.
chkdsk /r doesn't work in command prompt and comes up with: 'The type of the file system is NTFS. Cannot lock current drive. Windows cannot run disk checking on this volume because it is write protected.

Would anyone be able to help me resolve this? Thanks a lot.