Remember: Just because you can run IE 6 portably doesn't mean you should connect it to the internet. Treat it like a dangerous antique—admire it, use it for its specific purpose, but keep it in a glass case (or a virtual machine).
If the security risks are too high, consider these alternatives for running legacy IE code: internet explorer portable old version
Fortune 500 companies and government agencies built intranet portals using ActiveX controls, VB Script, and custom Silverlight components. These tools only render correctly in IE 5.5 through IE 8. A portable version allows IT support to run these apps without altering the host OS. Remember: Just because you can run IE 6