If I have AOL Explorer can I delete Internet Explorer?

Just to plainly answer your questiong YES.

1. go to add/remove programs
2. delete internet explorer

to go further in depth..

do not delete internet explorer it is a successful web browser that can be there in a time of crunch if you need it...do not use AOL explorer because this will use way too many of your computers resources..

Like the other girl said use firefox it is the most efficient and highly customizable way to surf the web and more

Personally, If I were you, I would use Firefox.
It's faster, and has add on capabilities.
You can customize it to suite you best.

But to answer your Q,
I wouldn't delete Internet Explorer.
It's nice to have around just in case.
and I'm not to sure about the AOL Browser,
If it's anything like AOL's service. It's probably slow