@jaclaz My original question was related to Open Source or Freeware solution, but I couldn't find anything in my search except for that program. The BartPE solution is okay if nothing else work. I would ideally like to have it so that I don't have to reboot. What I want to do is bring a drive with Firefox, Thunderbirds, and other programs to work so I can check mail and run those without having to install those programs to the work comp. I know there are portable versions of Firefox and Thunderbird, but since I didn't make it myself, I don't particularly trust the package (I'm just a bit paranoid!) and there are other apps that have no portable versions. I'll take a look at the links provided, thanks!