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 –
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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
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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’
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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.

I have a Toshiba laptop and my CD/DVD drive suddently stopped being recognized by the computer. I was working with some DVD movie maker software to transfer old movies to DVD’s and now it’s like I don’t even have DVD drive. It worked a couple of days ago. Ran a diagnostic and it failed. Is there something I can do?
Pinnacle is the manufacturer of the software for the movie maker and they say that this is a common problem and says to change a particular item in the registry. I am very afraid to change anything in registry.

I have a Toshiba laptop with Windows Vista.
Is there any way you can restore your registry, and would that help with my computer freezing up all the time?

My problem is stated below?

Whenever I am trying to format the hard disk of my toshiba laptop it is giving me the following message. Make sure any hard drives are powered on and properly connected to your computer and that any disk related hardware configuration is correct. This may involve running a manufacturer-supplied diagnostic or setup program.
Setup can’t continue. What would be the problem? May be the disk is sata if so then from where should I download the other softwares for it with the xpsp2 cd.

I have a Toshiba laptop and use the Wifi access. It seems like my computer has a rough time loading pages. Is there anything I can do to speed up my computer?