it seems that i am using one software that can make any program portable, prayaya V3, anyone heard of ? but actually and amazingly, it works so far. it is a virtual operating system carried on a usb or ipod etc and it allows you to install any windows running software on it with any other plugins or modification. so v3 and all your software will be carried on usb, and it seems has its own registry. no trace on any computer. it says so, but it is generally so from my experiece. any one interests or used before??