Satellite Pro A100-830 with 4Gb of memory but BIOS tells me I only have 3Gb

I have a Satellite Pro A100-830 and I bought the maximum allowed memory for it which is 2x2Gb which in my world totals 4Gb. When I put the dimms in on their own in either slot, the BIOS reports 2Gb. Well done bios! When I put them both in together, I only see 3Gb in the bios!
I did find this link on the Crucial website. http://www.crucial.com/kb/answer.asp?qid=4251
It would suggest that page files, devices etc take up memory on you system at start up, before the OS kicks in I assume. If you have not got the maximum memory installed, you should see the total memory. If you have got the maximum memory installed then you will not see the memory in use by the page files etc. Why would this be? Why would you see 2Gb if you only have 2Gb but then see only 3Gb if you have 4Gb because of the system!
Can anyone shed any light on this subject and either qualify or reject the information in this link. Do I need to replace the memory and/or the pc?
Thanks
Mark

Why would windows have an effect on what the bios is reporting since the bios has not even loaded the OS at this point.
I am happy that system hardware (nic etc) might take some of the resources, it confirms that here (http://www.transcendusa.com/Support/FAQ/index.asp?axn=Detail&LangNo=0&FAQNo=337) but not 1Gb in total!
BTW, it is Transcend memory and I put it into my Tecra A8 and the BIOS reported 4096Mb as expected. When we put a 1Gb and 2Gb in the A100-830, it reported 3Gb as expected. (3143680 to be precise!) When both 2Gb were installed it reported EXACTLY the same, not even an extra byte. According to that link above, you might expect to only see 3.6Gb out of 4Gb which would be OK, but I am not happy about a machine that needs 1Gb for system resources!
So unless you can explain how windows is effecting the bios reported installed memory, then this machine is gone! The bios should not care if you have windows, linux, dos or anything else for that matter.

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