Did you do the Upgrade
install where your programs, files and everything remained in place, or did you do the Custom
Install which installs the OS fresh and which may have placed your files in C:/Windows.old folder if the installer was not booted?
If you cannot now get into Win8 to get to your files then you can copy them out to external using the Windows 7 DVD or flash stick installer with this method: Copy & Paste - in Windows Recovery Console
, or use free Paragon rescue disk to recover data
. You may have to only rescue the files you absolutely need to save time.
Once you have your files you can try running Vaio Recovery to see if it will run, or boot the Windows 7 installer to Clean Reinstall Windows 7 Factory OEM
I gave you the ISO links for the official Windows 7 installer with SP1 to burn to DVD or write to flash stick and the tool to do it with. You might have to use another machine to do this, then boot the DVD/Stick to clean reinstall following the steps I gave you.