ASP Editor

Microsoft Visual Interdev
or

HomeSite

But you can use anything you want from Notepad upwards, Microsoft Visual Interdev usally is the prefered solution as you can have files in source control amongst other features.

Microsoft Visual InterDev fits best since it comes with Syntax Highlighting, IntelliSense, an Object Browser, full ASP documentation, and MSDN. A disadvantage may be that it's a web sites' management tool, too, and that there are some features being "too automated".

Allaire HomeSite is a rather source code-orientated editor, and comes with "some kind of" Syntax Highlighting and IntelliSense, too.

Macromedia Dreamweaver is rather a tool for HTML publishers (i.e., mouse-orientated, automated DHTML features). It doesn't destroy ASP code but doesn't provide Syntax Highlighting, etc.

You can also write ASP code by Notepad.

There is a neutral and detailed(!) discussion about ASP editors at http://www.chilisoft.com/whitepeppers/devtools.pdf.

I would suggest ultraedit,
www.download.com

There are EditPlus, HomeSite and of course Interdev.
I prefer Homesite for myself :)
Interdev is good, but It also takes a lot of resource ...

As you're new at EE: Let the questioner decide himself, and don't lock questions if you cannot provide the only possible solution.