KB929605 showing reduced RAM value

MS support uses this KB article to explain why my 4GB RAM shows up as only
3326MB but this article also says that a cure is to use Vista 64-bit. I
tried that but it still showed exactly the same reduced amount of RAM and not
4GB (4096MB).

So that work around instruction is wrong and cost me a great deal of time
and data trying it.

Also, if the explanation in this KB article is correct then why doesn't the
problem appear with any amount (½GB; 1GB; 2GB) of RAM?

Norman Castel