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Actually, you can successfully install two independent IE versions that live and work freely simultaneously .. but that entirely depends on your computer skills. I've done it before, but it's a lot of work, and I do not recommend messing with it.
But if it works in IE 5, you don't have to worry too much about IE 6 .. especially not if you make IE6 render the pages in "quirks mode".
Internet cafe's are a good way for checking for different browsers.
If your web site validates with the W3C HTML validator, you have a better chance that your site will work cross browser/platform.