I used my old computer to get the file I needed from gamecopy world and I sent it to myself on my windows 7 computer. I told out the old tin3 file and replaced it. but, it still crashed all the time while starting and someone had said to always start in the game in small window (alt + enter) and then I could get it to work. but, if I went to resume game it crashed again. So, I always had to start a new game in the small window and finally when Carlotta got into the office I could make it large screen again and then I could click on F1 to resume game. I did have to save often, as it still crashed once in a while, but, I could finally finish it. Sometimes I left my computer on with the game running all night as I was too afraid to shut down the game. Anyway, that is what worked for me.
I just replayed it again and found out that towards the end, it is best not to click through the dialogue, just to let it play through. It crashes a lot towards the end, but, if I just let it go and didn't click, it would not crash.