You need at least 2 screen recorders and to record events is reccomended,you never know what might happen.
Recommended screen recorders are: Hypercam2,Camstudio,Camtasia,Jing,Screen recorder gold. If you have one of these you are good.
Backup screen recorders should be: Jing,once running,there will be an orange sun at top of your screen,good for random TPB events.
I'm making a videeo right now on free screen recorders and their quality.