I think you need to install the Shared Library and Notebook Control Utilities....that s what I had to do to get the FN keys etc working... you can get it from the sony e support website.
Make sure you install the shared library first and then the Control Utilities....and run the file as an admin in compatibility mode.
Hope this helps
My Computer
At a glance
Win 7 Professional x86Intel(R) Pentium(R) Dual CPU T2370 @ 1.73GHz2.00GB PC5300