Hi,
See if this assists you.
Do a System Restore in Safe Mode.
"System Restore in Windows 7:
http://windows.microsoft.com/en-us/windows7/products/features/system-restore
"Advanced startup options (including safe mode)"
"The Advanced Boot Options screen lets you start Windows in advanced troubleshooting modes. You can access the menu by turning on your computer and pressing the F8 key before Windows starts (Tap F8 at the rate of about once per second)"
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If that fails.
Make your own System Repair Disk from the information in this Tutorial:
"How to Create a Windows 7 System Repair Disc"
http://www.sevenforums.com/tutorials/2083-system-repair-disc-create.html
"This will show you how to create a Windows 7 system repair disc to be able to use to boot to **system recovery options** to help recover your Windows 7 installation if you don't have a Windows installation disc, can't find your Windows installation disc, or can't access the recovery options provided by your computer manufacturer.
A system repair disc is not able to install Windows 7.
Note
If you are unable to boot your Windows 7 to create a Windows 7 System Repair Disc, then you could create it on another computer to use on your computer."
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Then use that Disk for the System Recovery Options:
"System Recovery Options"
http://www.sevenforums.com/tutorials/668-system-recovery-options.html
"How to Run a Startup Repair in Windows 7"
http://www.sevenforums.com/tutorials/681-startup-repair.html
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If that does not work.
Go to your Computer Manufacturer's website > look for your Computer's specifications > find out brand of Hard Drive > go to Hard Drive Manufacturer's website > find and download Hard Drive Diagnostic software and make a Bootable disk from it on the Computer you are using to get here, following their instructions > test your Hard Drive to see if it has failed.
And you can also use this Method to test your Hard Drive:
"SeaTools for DOS"
http://www.seagate.com/support/downloads/seatools/
"SeaTools for DOS tutorial"
http://knowledge.seagate.com/articles/en\_US/FAQ/201271en
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And how to attempt to save your Data if possible.
Saving your files:
You can pull the Hard Drive and put it in a USB Hard Drive Enclosure > plug it into another Computer > and attempt to read and copy over your Data that way.
Or, you can download Knoppix > make a Bootable disk from it > Boot into your System with it (IF your Hardware is all working) > and copy your Data from the Hard Drive that way.
"How to use Knoppix"
http://lifehacker.com/192982/geek-to-live--rescue-files-with-a-boot-cd
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And this may work to reinstall if you save your Data and the Hard Drive works OK.
Sony Vaio – Tap F10 at Boot until the Edit Boot Options screen is displayed