Acer Aspire One ZG5 doesn't start

Hello,


my Acer Aspire One ZG5 doesn't start windows.
One day the battery fell out by accident and when I put it back and restarted it,
windows wouldn't start. It will show a blue screen for half a second then it starts rebboting again. I tried safe mode, starting with last working settings, etc..
I also tried booting up with using an USB drive with the updated BIOS. No luck.
It's BIOS version is v.3305.
After taking a shot of the blue screen with my camera I managed to read the info it:

"A problem has been detected.....

UNMOUNTABLE_BOOT_VOLUME
......
.....

Technical information:
*** STOP: 0x000000ED (0x86B45158, 0xc0000006, 0x00000000, 0x00000000)

How can I restart my computer again without loosing all my documents on the hard drive?

Thank you