How'll you customize internet explorer to your computer?

yes

Yes of course you can.

There is no current version of Internet Explorer available for the Mac. Internet Explorer for the Mac was discontinued in 2003 and Microsoft recommends "that users migrate to more recent web browsing...

Yes. You can even use them at the same time. Internet Explorer is not removable through ordinary means, so Mozilla Firefox has to be able to work on the same system if it is to be used on Windows.

if you get a windows computer, yes