Those codes don't seem to make much sense to me. I'm afraid. Unfortunately things seem to be getting worse. I scheduled a disk check (I only selected the file system option, not the attempt to repair bad sectors), and re-booted. It ran through and flashed up some details, but only for a second, and no way long enough to note anything down. Then it shut down. So I powered up again, and got as far as the Windows welcome screen, and then no further. Force released again (as there is nothing on the screen to select any other options), and tried pressing F8. Now I only get the list of device drivers, and after a wait of several minutes (during which the HDD access light is continuously on) nothing. Not even safe mode...
Looks like a trip to the local computer shop for a Windows recovery disc - we didn't get one with the machine.
Some new years present!