Vista computer fails to boot, not in safe mode, no disc

My Windows Vista computer won't boot anymore. The Toshiba logo shows, then it goes to a black screen with the option of "Startup Recovery" or startup normally. Both options then bring me to another black screen:

"Windows failed to start. A recent hardware or software change might be the cause. To fix the problem:

1. Insert your Windows installation disc and restart your computer.
2. Choose your language settings, and then click "Next."
3. Click "Repair your computer."

If you do not have this disc, contact your system administrator or computer manufacturer for assistance.

Status: 0xc000000f
Info: The boot selection failed because a required device is inaccessible."

My computer never came with a Windows Vista installation disc. I've tried running this in Safe Mode and it loads some drivers, then flashes a blue screen and brings me to this black screen again. Same with "Last Known Good Configuration" flashes a blue screen and repeats the process. Please help I have important documents I need to recover form this computer! Thanks.