After installing Windows XP on the VGN-FE31H, the screen brightness keys (Fn-F5 and Fn-F6) no longer work. To make them work again you need to install some of the utilities that ship with the laptop, which are also available in the FE3_Utilities.zip download from the Sony web site.
The three utilities are:
- Utils Installer 1 SonyUtils DLL
- Utils Installer 2 Sony Shared Library (this one needs a reboot)
- Utils Installer VAIO Event Service
The “VAIO Event Service” needs to be running for the keys to work.
Richard Fearn 
I have the same problem on a Vaio vgn NS20E I have tried to download the above updates but I think my computer knowledge is insufficient to correct the problem .
The downloads are present on my laptop but I do not know why the fault still persists.
I am wondering if I have to do anything with these updates , ie do I have to run them
and ,if so ,how do I do this . ?Any help will be really appreciated .
Sorry, but I don’t know anything about the VGN-NS20E.
Are you saying that you’ve got a copy of
FE3_Utilities.zip? That’s specific to FE3 VAIOs, so probably wouldn’t work with your VGN-NS20E. There’s probably something suitable for your laptop on the VAIO web site.Secondly, you do actually need to the run the installers for these utilities; just having the file on your hard disk will do nothing.