Regarding the Cut & Paste, why not use Copy and Paste instead? Command + C & Command + V Regarding the 64 bit question, you can use Activity Monitor in the Utilities folder. However, the application(s) will have to be running. Regarding the startup apps, go to System Preferences -> Users & Groups -> Login Items Regarding the different OS, I personally install a fresh copy onto a Firewire drive and boot from that when I'm testing out operating systems. Another thing you can do is partition your current hard drive. Today's partitioning software lets you partition without having to reformat and lose all of your information. You can just install the OS on that specific partition then.