Can you help me fix my laptop?

Help, please! My laptop (Toshiba equium) isn’t working and I have no idea why. It has so much of my work on it and im desparate to get it up and running again, if any one can help I would be so so grateful.

It comes up with this on start up –
_________________________________________________________
Windows Error Recovery
Windows failed to start. A recent hardware of software change might be the cause.

If windows files have been damaged or configured incorrectly, Startup repair can help
diagnose and fix the problem. If power was interrupted during startup, choose start
windows normally.
(use the arrow keys to highlight your choice.)

Launch startup repair (recommended)
Start windows normally
_________________________________________________________

If I choose ‘Launch startup repair’ then it comes up
‘windows is loading files…’
then a loading screen then a window comes up saying –
‘startup repair is checking your system for problems…’
after just a couple of seconds this disappears and then a window that says
‘windows cannot repair this computer automatically’ comes up with theses options –
‘view diagnostic repair details’
‘view advanced options for system recovery and support’
‘finish’
And ‘cancel’
__________________________________________________________

If I choose ‘Start windows normally’ then a load screen appears for a few seconds before it simple restarts and goes back to the ‘Windows error recovery’ screen.

Please help.
The diagnositic repair retails are miles long, to long to type out.

I do not want to lose my information, I have important work on my laptop – please help.

Computer not turning on?

Ok i press on and it does exactly this: Its vista new laptop compaq presario

Black screen
takes longer than usual on the windows loader
black screen for like 15 seconds
black screen forever

RESTART PC AGAIN THIS HAPPENS

black screen
"windows error recovery"
"windows failed to start. a recent hardware or software change might be the cause. if windows files have been damaged or configured incorrectly, startup repair can help diagnose and fix the problem. if power was interrupted during startup, choose start windows normally
(use the arrow keys to highlight your choice.)

Launch startup repair (reccomended)
Start windows normally"

i click launch start up repair
black screen
Windows is loading files… (white bar under text)
black screen
windows loader microsoft corp
goes to a really old windows style computer with the blue background
stat up repair cannot repair the computer automatically.

iclick view advanced options for system recovery and support
i try all the things in there to help recover computer, none work. all fail, i go back and click view diagnostic and repair details

just shows basic info of my pc like 10 pages worth i click finish, comp turns off.
WTF DO I DO. its been like this like a week.

My brother built a new computer based around a new processor and motherboard, (intel Quad-core Q6600 and Asus P5E), along with a new case so it would be compatible(Antec 900). After transferring over these new parts along with the necessary older parts the computer works fine except for one problem. Everything powers on, the computer gets past BIOS and then goes to boot windows but instead he gets:

"Windows Error Recovery"
Windows failed to start. A recent hardware or software change might be the cause.

If windows files have been damaged or configured incorrectly start up repair can help diagnose and fix the problem. if power was interrupted during startup choose start windows normally.

Launch startup repair(reccomended)
Start windows normally

Whenever he starts windows normally he gets the blue screen of death and an instant restart. If he launches repair it goes to a loading bar that completes in about 5 seconds then just sits at 100% and does nothing.
P.S.
We do not have a copy of windows vista, it came installed on the computer and we never recieved an actual copy.
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To Tina G
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He cannot get to the actual desktop to do any of that from, windows will not launch.

When I restart my computer I keep getting a black screen with the message

Windows failed to start. A recent hardware or software change might be the cause. If
windows files have been damaged or configured incorrectly, startup repair can help
diagnose and fix the problem. If power was interrupted during startup. Choose start
windows normally

Launch startup repair

Start windows normally

When I choose either one it goes back to this same screen asking it again. I also tried
using the reinstalling dvd windows vista home basic 32bit

When I press f 8 it gives me a list of options on advanced boot options
I,ve tried repair your computer and safe mode and it still does the same thing

When I restart my computer I keep getting a black screen with the message

Windows failed to start. A recent hardware or software change might be the cause. If
windows files have been damaged or configured incorrectly, startup repair can help
diagnose and fix the problem. If power was interrupted during startup. Choose start
windows normally

Launch startup repair

Start windows normally

When I choose either one it goes back to this same screen asking it again. I also tried
using the reinstalling dvd windows vista home basic 32bit

When I press f 8 it gives me a list of options on advanced boot options
I,ve tried repair your computer and safe mode and it still does the same thing.