Hi again,
for all of those who would like to upgrade their RAM, you can go to
www.youtube.com and search for "upgrade ram laptop" (you can try different keywords).
You will find many videos explaining how to install the RAM modules. It may not be a Fujitsu-Siemens laptop, but the process is pretty much the same.
Keep in mind that there are a lot of tutorial-videos on YouTube (or other video broadcast services) on many different topics.
Also. before you start, read the manual of your laptop (chapter "upgrading memory") to see which part of the laptop you need to unscrew. And watch for static electricity!
cheers,
Argyrios