I agree Iman. Do what is easiest first. I guess to me reinstalling/upgrading IE isn't a huge deal. But to each their own. If you want to reinstall/upgrade IE here is the link for that.
http://www.microsoft.com/windows/dow.../getitnow.mspx
Another note, if you do upgrade, (I don't see why you wouldn't want to) then all your favorites will migrate from IE 6 to IE 7 just fine and you won't have to re-link to all of those sites.
And to answer your question Iman, you can uninstall/install IE. Here is the link for that if you want to take a gander.
http://www.microsoft.com/windows/pro...a&mg_id=20316b