OMG dear lord   I forgot you couldn't renderize my aircraft  ,yes the gforce 3 its too old , BTW the Service pack two SP2 was for only the gmax software, sorry Boi I forgot .. you need to buy one of the cheap at least as I told you before..

I don't know what was in my mind buddy

edit:
But hey ! you didn't need to install SP2 for the FSX only for the FSX-SDK ,see there are 4 SP
1 FSX game
1 FSX-SP1 game
2 FSX-Sp2 game

this is another diferent thing and has nothing to do with the game ,this is only for gmax and 3d studio max

3 FSX-SDK
4 FSX-SDK-sp1
5 FSX-SDK -SP2

I have a secondary instalation in a control pc next to my main one
Is a pentium 3 with 320 RAM and an all in wonder raydeon Very Old card ,IT HAS FSX-SDK-SP2 AND IT WORK FINE  without the game of course 1 game per machine , I use it to check the other models while Im making a new one ...

So you can unistall the game reinstall up until Sp1
But the FSX-SDK you can fully install the SP1 and 2 completly