I'm going to start with the usual noob line, "I'm new to rails". Oh, and I'm running Mac OSX 10.6.4

I've been following a bunch of guides to get set up, specifically these two [here](http://www.robbyonrails.com/articles/2010/02/08/installing-ruby-on-rails-passenger-postgresql-mysql-oh-my-zsh-on-snow-leopard-fourth-edition/) and [here](http://spyrestudios.com/setting-up-a-rails-development-system-on-mac-osx-snow-leopard/). The guides are great, the reason I'm using the second one is because of RVM and the reason I'm using the first is for MYSQL.

Anyway, when I started, I wasn't following the directions completely and so after I installed RVM, for some reason I installed rails with `sudo gem install rails -v 2.3.8` because thats the version I need. So... I realized I was using the system ruby, and wasn't taking advantage of RVM. What I did now was install Ruby 1.9.2 so I can install rails 3 and test it out, and I also installed 1.8.7 and rails 2.3.8 so I can use it for what I need it.

Now, I'm trying to uninstall the gems from the system Ruby, but whenever I try to I'm getting this error:

> 
> ERROR: While executing gem ...
>  (Gem::InstallError)  
> 
>  cannot uninstall, check 'gem list -d
>  ***whatever gem I try to uninstall***'
> 
> 
> 

Any ideas on how to remove rails and all these gems? I just want to start from scratch with RVM.

---

**UPDATE:**

By running the command `gem list -d rails` I've located the gems in /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/18. Should I delete them manually?