Hi morrir,
I wrote my recommendations here:
http://www.simviation.com/cgi-bin/yabb/ ... 10720318461- Simply put, you want at least 512MBs of system RAM to run CFS3. 768MBs would be better.
2- Your graphics card really needs upgrading. The Matrox 550 (32MBs) is getting so old that you can buy one for around 30 bux now. It just can't run the newer flight simulators of today.
If you can afford one get at least an ATI Radeon 9700 Pro. I've had mine for over a year now and it's a great video card. They're around $220.00 now. Make sure that you get the Pro version.
The ATI Radeon 9800XT is the best video card available now but they cost between $450.00-$500.00. OUCH!
Your P4_2.0GHz processor is plenty fast enough for CFS3. It's just your RAM and video card that's holding you back. You'll see a HUGE difference if you just do these 2 upgrades.
Good luck.