Not so much this, but you may want to try using Group Policies to limit the resources that the guest account has
access to in the workgroup. You can do this by opening a run dialog box and typing mmc and hit enter. Then you'll want to
add the correct snap in's. Add the Local Computer policy, and set the access that you'd like. You can Also use NTFS permissions
to limit access to Shared Files, Folders, and Printers.
The MMC would be a starting place. The nice thing about these two methods, is that they're mostly intuitive.
Creating an MMChttp://support.microsoft.com/kb/230263
Local Group Policyhttp://support.microsoft.com/kb/307882
How to set NTFS Permissions.http://technet.microsoft.com/en-us/library/cc785795.aspx
Please be aware of what NTFS permissions are prior to setting them
for users. Setting them incorrectly can result in undesired effects.
I suggest google prior to using NTFS permissions.