Attempting Repairs Message After Windows 8.1 Update

I have a Toshiba Encore, which I updated. When I start it up it has the message 'Preparing Automatic repair', then a black screen and a Windows windows flashes up for a split second. I then get the message 'Diagnosing your PC', the 'Attempting Repairs'.

I then get a blue screen with the title 'Automatic Repair' with the message: Automatic Repair couldnt repair your PC...... Log file C:windowssystem32logfilessrtsrttrail.txt

There are two options 'Shutdown' and 'Advanced options'.

'Advanced options' gives:
Continue'- exit to windows 8.1
'Use a device'
'Troubleshoot'
'Turn off your PC'

Troubleshoot gives:
'Refresh your PC'
'Reset your PC'
'Toshiba maintenece'
'Advanced Options'

Advanced Options gives:
'System restore'- ive tried this but there are no restore points
'System image recovery'
'Start up repair'- Tried this, just goes to 'Preparing automatic repair'
'Command prompt'- This works
'UEFI Firmware Settings'
'Start-up Settings'- Tried this, just goes to 'Preparing automatic repair'

So apart from refreshing and resetting which I haven't tried yet, I can get into a Command prompt. The command prompt starts in X:. When I open Notepad and browse the file system i notice that X: is called 'Boot'. I'm wondering whether the 8.1 update has put something on my PC that makes it try to boot from X: instead of C:. Is there any way I can check what drive the PC is trying to boot from?

The log file states
Root cause found: Boot manager failed to find OS loader
Repair action: File repair
Result:failed. Error code 0xa

Repair action: Boot configuratio data store repair
Result:failed. Error code 0x490