How to fix HP Pavillon Dv6t Hard Disk Error 305?

I have an HP pavilion Dv6t. I have had it crash before which turned out to be a bad version of vista Now it will not boot but i can run all the tests...they all p but in the error log there is 305 wic is Hard Disk 1 Full. I know for a fact that it is not full. I have read about Vista reading the hard disk wrong and causing this. Im not too sure what to do..there are some important files I need off of there. Any suggestions on how to fixthis or save my files?? It will not start up in safe mode or after start up repair.