I'm using emacs Emacs 23.3.1 and cl-macs.el is installed.
I type arc-mode and I get Arc in the menu, but when i choose Run inferior-arc error message:error: Required feature `cl-macs' was not provide.
What is arc.el? There's no arc-mode for Emacs that I know of. What are you expecting to happen when you type M-x arc ? Where did you get arc.el?
I wrote up instructions on how to get SLIME working with Arc, but I don't have a Windows box to test on. Can you translate the directions to Windows, and then see if it works for you? http://arclanguage.org/item?id=14998 Notably, you don't start SLIME by typing M-x arc-mode; you start it by typing M-x slime .
I definitely use arc.el on a regular basis, though I won't claim to be familiar with the finer points of its capabilities. As far as I'm concerned, it offers reasonable highlighting and indentation for arc code; I haven't tried to get it to do much else. For most of my lisp editing needs, I rely on paredit.