The beauty of that program is that is has heaps of options without the need to navigate the registry.

Also I find that the guest account is a little too restrictive at times, whereas XP-Protector allows you to customise everything so you can lock down an account the way you want. You are not restricted to Microsoft's "guest" settings.

Here's a link to the free version (0.5): http://www.dolinaysoft.com/xpprot.exe