To ask the question to toni07 Directly:
can you open up your PC box and see for me, how many RAM sticks do you have? one or two?
Your machine can have 2x2GB RAM = 4 GB
-->3.5 (+/-) RAM for your Windows
On monday at work i can see if we have some RAM that can be used with your Machine, and i hope i find 2x2GB of RAM to send to you.
Or maybe you only need one...
Thank you for the Link for the Manual, it is good to have this precise information!