How to uninstall IE6 on WinXP? I am getting problem when I start uninstalling.

I'm not sure if this will work but go to start > control panel > add remove programs > then on the left click ADD REMOVE WINDOWS COMPONENTS and you should see internet explorer

You cannot uninstall IE in XP as it is deeply ingrained into the OS. You can try to repair it:
How to reinstall or repair Internet Explorer in Windows XP (http://support.microsoft.com/kb/318378)

How are you attempting to do the uninstall? Control Panel?