New
#11
Netzero bloatware is just a URL link which you can rightclick to Delete.
IE9 can be turned off (not uninstalled) in Control Panel>Programs and Features. But I'd have a backup browser because sometimes a URL will not open and on the fly you want to be able to open and paste it in another browser to keep working until you have time to see what's wrong with your browser.
If you choose to keep IE make sure it's 9 and kept updated, as is best with any browser. In fact be sure to keep Updates set to Automatic and install them all since this is a key to safety and performance and any problem Updates are more than one in a million.