Try downloading Internet Explorer updates from the Windows Update site.
It's not a good idea to uninstall Internet Explorer as it is an integral part of Windows and is used in many Windows applications besides just as a browser on its own eg. Windows Explorer uses IE technology. So a lot of stuff would stop working if you got rid of it entirely.
You could try a reinstallation of IE6 straight over the top of the existing one. Might bring up a repair option.