Download Internet Explorer 8 Portable
Internet Explorer may be one the worst browser you ever used but we still have it in our PC because it comes with Windows. The latest version of Internet Explorer is said to be better then its previous version with many new features which includes WebSlices, Accelerators, Tabbed browsing, Suggested sites, InPrivate Browsing and Filtering mode, Authenticated feeds, Smartscreen filter, Streamlined Interface, Instant search box, favorites center, RSS Feeds, Page Zoom and much more.
Although there are other browsers (e.g Chrome, Firefox, Opera) available as well which are much better then Internet Explorer but you need it because there are some websites on the internet that do not open properly in them so if you work, you need to have Internet Explorer if you want to view the site properly.
So if you want Internet Explorer but do not want to install, then you can just keep the portable version of Internet Explorer in your USB drive and use it when you want to. You can download Internet Explorer 8 Portable from the link given below.
Internet Explorer 8 is very good because it is as stable as Opera. I hate the previous versions of IE like IE6 because it hangs frequently. ~