Great stuff , but isn't easier to run msconfig and go to the startup button , there you can shut down everything thats running in the background . What do you think ? I tried making a screenshot when i was flying an F-15 and i did everything you said and it did'nt work of course . i'll try it again later . That no cd thing what does it do ? How can it improve the performance of the game ? Does'nt the program take up a lot of space ? I know i have a lot of drive space to work with , can you tell me how big that program is ? When your flying FS 2004 what's your frame rate ? Cya , hope to hear from you soon .

Okay, one thing at a time...
The trouble with msconfig is that when you turn stuff off, the computer boots in safe mode. Also, some stuff you turn off turns itself right back on when you re-boot.
The way I turn uneeded services off in through the management console. To get there, right-click My Computer and select Manage. Select services and applications from on the right side. Then services from the right side. (I'll send a list tomorrow).
My steps didn't work for you? Hmmm...
Do you have Paint open before you start FS?
If you do, then you can Alt+Tab over to it after hitting the Print Screen key (if that doesn't work, try hitting Alt+Print Screen). One of the 2 should get you a screenshot. Save it and go back to flying.
The No-Cd.exe keeps the game from having to access the CD-ROM, so the computer can keep it's attention on running the game. It's a small file (smaller than the original exe, you replace it)
FS Autostart shuts down all those proceesses that run in the background, and are not needed during most games (especially Flight Simulator). And while they are running, they slow down the game. It re-starts them after you shut down the game. It adds maybe another minute to your loading, but hey, it's worth it. It's not big (the whole folder is less than 400Kb)
I can't say for sure how much this will improve your system's performance, since your system is newer than mine. I know it did on mine though.
PIXresizer is also small (less than 1MB) so you're not putting that much, and its
great for editing the photos to the requirements listed on the upload page.
I've never really measured my frame rate (how do you do that?) I do know it varies according to traffic and how much clouds the game has to draw (mine is set to real-world weather).