Any file that is not backed up is a file you should expect to lose.
It's a good idea to have a full system backup that includes Windows and all your programs, too, for
when the hard drive fails. It may have failed already.
stop 0x0000001E: KMODE_EXCEPTION_NOT_HANDLED - Often a hardware problem. Bad RAM possible.
Can you get into Safe Mode or any of the other boot options now?
Try testing memory.
Memory Testing (including bootable CD's and floppies):
Memtest86 MemScope (Floppy and CD images.)
Roadkil's RAM Test Microsoft Memory Test (floppy or CD ISO image)
If you have enough memory sticks, you can test them by removing one at a time and see if the problem disappears.
If you are running Vista or 7, tap F8 on boot and choose the memory diagnostic, or if you can boot up, go to Start > Search and type:
mdsched.exe
Choose to run a memory diagnostic on next boot. Or, you can boot from the DVD and run it from there.