Quality is delighting customers
Are you looking selenium RC, Selenium CORE to install?. If selenium IDE , it can not be installed on IE.
Selenium cann't be added to IE. The IDE is only available for Firefox.
If you wanna test in IE, then launch the app in Firefox(FF) and then record using FF and then later on inherit/use the same for IE. (Selenium works for IE too just a few minor modification from the firefox)