w4p, first, just starting up Windows XP takes 120 to 140 MBs of RAM.........and that's straight out of the box.
175 MBs seems a little high to me, but then I don't know what all you have added and may be running at start up.
I strongly suggest you get FSAutoStart. You can use this program for any game you have, not just FS9. Once each is set up, and doesn't take long really, it is then just a matter of a couple clicks and FSAutoStart does the rest, even starts them back up when you are done.
It would be very easy to compare your list against those listed in this program and set it up that way. Bet you find some that you didn't see before too.
The beauty of this program is that you CANNOT harm your system. A reboot will fix any problems or reconfiguring it will do the same thing.
I promise you, once you learn it (and it isn't that hard with my picture tute up above) you will be glad you got it.
Up to you, but you should at least try it out and see for yourself. No permanent changes are made to your system and this program is totally safe. I, yes me, didn't and haven't messed anything up with my system and I use it for all my games and have been using it for quite some time.
Good luck and enjoy.