I guess that might be the case for most of us when it comes to computers only running Windows.

Now there is a nice solution for us: Portable Firefox (Run it off a USB Drive).

Starting with version 0.9, Firefox now supports running from removable drives with minimal reconfiguration. To make life even easier, John Haller has repackaged Firefox as a complete, removable drive-friendly browser. The idea grew out of a mozillaZine forum topic. Any comments or questions can be directed there or you can contact him directly.

Now please make the Portable Thunderbird as well!