Computer keeps booting into system repair

my PC keeps booting into system repair each time I start it with windows vista loading screen

this happened after I downloaded updates for my PC then restarted to install them and now it keeps going to system repair
is there any way to fix this without clean installing? thanks

and also when the startup repair finishes it says it can't fix the problem and gives a code

Problem Event Name StartupRepairOffline
Problem Signature 01 6.1.7601.23455
Problem Signature 02 6.1.7600.16385
Problem Signature 03 Unknown
Problem Signature 04 81
Problem Signature 05 AutoFailOver
Problem Signature 06 1
Problem Signature 07 MissingOsLoader
OS Version 6.1.7601.2.1.0.256.1
Locale ID 1033

townsbg said:

I suggest that you try this. MBR - Restore Windows 7 Master Boot Record

doesn't work, I still keep booting into system repair