Look for the software for the features you like on the Vaio Support Downloads webpage for your model. If it's there then you can try it, if not you may not want to Clean Reinstall Windows 7 Factory OEM
but instead try running it for awhile while Cleaning up factory bloatware.
You can also find out the name of the features you like and google everything you can read about them to find out how others have fared with a clean reinstall. The ones which have problems like the webcam and touchpad software features on some Samsung laptops often have been thoroughly hashed out in various forums including ours.