Elder Scrolls 4: Oblivion
I have the trainer for the origianl version and everytime I use it oblivion crashes. I am using Vista, does that matter?
If you bring down the cheat panel, type "help" and it will show you a whole bunch of commands for adjusting your character.
If you are having difficulty with some enemy, I would suggest you just add some armor, or a better weapon or something like that. I broke the game a couple of times when I was first experimenting with character editing by going overboard on a couple of things. However, duplicating items that are in the game already do not seem to affect it at all: armor, weapons, amulets, rings, etc)
...hope this helps