HELP ME!

One day when I was checking which resolution would fit my computer best, when I chose a resolution, the game crashed! I can no longer play TSF! I can still click on the game icon and go to the menu, but I can't play. And when I tried to change the resolution at the video options, it didn't work. I don't know where the CD to TSF is, so if anyone can solve this problem so that I don't have to reinstall TSF, which I can't, I will make a tileset/level for that person (unless he/she thinks my tilesets/levels are horrific and tells me not to make anything)

EDIT:
I found the CD now, but I can't uninstall my old TSF and when I install a new TSF with the CD the new one also gets an error message. I don't think it has anything to do with the resolution.
About the resolution error: It ignores it-always when I start the TSF again the video options shows the reolution I chose but the screen doesn't use it.
The error I getis an access violation.