You definitely won't want to be using Crossover 7.1 - that version won't work on Snow Leopard, at all.
Try this - first, launch Crossover Games 10.1, and head to the Configure>Manage Bottles menu. Use the "-" key to delete any Wizard 101 bottles that you find within.
Then, close Manage Bottles and go to Crossover's Preferences menu. In "Installer Assistant", make sure "Automatically Download new application Profiles" is checked.
Now, launch Crossover's Install Software menu, and then click on the little grey arrow next to "Community Supported Applications". Scroll down to "Wizard 101", and then click on "install". Crossover should now download and install Wizard 101.
If you have further trouble, feel free to file a support ticket so our staff can help you troubleshoot the issue:
http://www.codeweavers.com/support/tickets/enter/