Advanced Users Guide
4. How to set-up Folder Sharing in Windows® Vista™ (continued)
11. Click [Apply] – [OK] so you will complete adding "Guest" account on the sharing tab menu.
Click
12. Confirm that there are both "Guest" and "Everyone" accounts on the [Security] tab menu.
If there is no "Guest" account, click [Edit...] (Both accounts should be placed).