The best I can suggest is to use this free utility that'll let you change the resolution instantly by clicking the shortcuts.
You create two icons on your Desktop one for 1024x786 and the other for 800x600 and simply click the appropriate icons when you want to switch the resolution.
Here is the link:
I recently aquired a program that looks much better in 1024X786 resolution. However, I usually use 800X600. Is there any program that will let the program switch the res. on it's own? I want the screen to switch every time I open that program. Is it possible?