VB Script has been incorporated in all OS's since Windows 98 - it's already there, so what exactly are you trying to do? You can't recode IE as it's a system application.
VB Script is simply a language you can use in web pages etc. Although it's use is dwindling of late from what I read online.
Read about it here:
VBScript - Wikipedia, the free encyclopedia
See also:
http://www.vistax64.com/tutorials/139940-tutorial-index-3.html#post738338 letter V.
IE uses whatever language and script it needs at the time you use it.
When IE refers to Scripting in Tools/Internet Options/Security - Custom Level....it's VB Script in general it is referring to.
Maybe you should be asking a forum that specializes in Scripting such as on Technet for instance.
Microsoft TechNet forums