The safest and simplest way is to use portable
applications—applications that don't need Registry entries,
and don't leave data behind—like the trusty DOS apps of yore.
This isn't the same as a full-session environment, but there's
less to go wrong. Or, of course, if you can do a reboot from USB,
you can do a Linux stick, or even Linux and a VMware virtual machine
of your Windows system.
...
Studio UniT3 Music Search results for portable applications