The manufacturer's web-site:
http://esupport.sony.com/CA/perl/model-documents.pl?mdl=VGNNS160DW
is totally non-helpful.
If you have the 32-bit version of Windows Vista, then the maximum supported by Vista is 3GB.
If you have the 64-bit version of Windows Vista, then the maximum supported could possibly be larger.
But, of course, the motherboard would have to support more than 2GB.
Best advice: take the computer to a computer-store, get them to install more DDR2 RAM, and see if the computer will recognize all of the RAM.
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