In situations like this it's almost a certainty that several critical system files have been damaged or corrupted. It might be possible to use these troubleshooting guides and get your Vaio working again. Troubleshooting Windows 7 Failure to Boot Troubleshooting Steps for Windows 7
The tutorials will be time consuming and have helped many. But there are two other options that might appeal to you. The first is a repair install. It will try to fix your currently installed Windows 7 while preserving your user accounts, data, programs, system drivers
, etc. The repair usually takes less than an hour but you will have to reinstall Windows Updates. And that could take another hour or more. The big advantage is if the repair install works you won't have to reinstall programs or reconfigure your personalized settings, etc You'll need a Windows 7 installation disk and you can get a free legal copy from the link in the Warning box (third warning.) Repair Install
The second option is to do a complete reinstall of the operating system. I did this to my Vaio VPCEB47GM and it's amazing how much better it runs without all the factory bloatware that came pre-installed. Clean Reinstall - Factory OEM Windows 7
If you decide to try any of these there are many people available on this Forum who can answer your questions or help walk you through the steps.