Try http://www.sony.com and download the driver for Windows 7. Most of the time the Windows 7 drivers will work. YMMV. Next time you do an upgrade, you should make a full system backup and be sure you have the drivers you'll need BEFORE installing the upgrade.

When you've gotten your system back like you want it, I urge you to get yourself an external hard drive and a good 3rd party backup program. You can set it up to do everything automagically at the time and frequency of your choice. 1 TB external hard drives are about $70 these days and a really good FREE backup program is the Easeus todo backup free which you can download from
http://www.todo-backup.com/products/home/free-backup-software.htm . That can save you a lot of time and frustration the next time something like this happens. Sooner or later it happens to all computers for one reason or another.