There is a remove (and a repair) option for IE6, but as you can see posted here, it doesn\'t always work. I\'d say it\'s relatively safe to try out, just make sure you have backups, just in case. It\'s a beta, and unexpected things can happen (hell, even finished products give problems all the time).
IE6 works fine for me, but I\'m using the version that comes with WinXP. Since there\'s no upgrade to be done, I skip a lot of those problems.