After a HDD fail, I have put a new HDD into the machine and loaded Windows 7 Ultimate 64bit. Everything is working except the Fn modifier to the function keys. I have downloaded the drivers etc from the Sony website, but still no Fn key. I do have a process called HKcmd.exe but that is the only thing I can see that could be related to hotkeys or similar. Any help or advice would be appreciated. Thank you.