Hi paulindr,
The reference you are quoting is not the product model. If it has PCG-394L on a sticker on the underside then it is possibly a VGN-FZ series - have a look on the screen surround. Once you have located the correct model number you will be able to download any available updates from the support site.
http://www.sony.co.uk/support/en
Regarding the battery, if this is a genuine replacement no software install is required and no software will be found on the Support site. Some foreign imports require a BIOS tweek - do this at your peril as they have been known to brick Vaios...
Rich