The method of sharing in windows vista is quite different from what it's used to be compared to windows xp.
Luckily, there's still a way to share out folder like what we do in windows xp.
1. Right click on the folder you want to share, select properties (don't select share...)
2. Select the sharing tab
3. Click on Advanced sharing button
4. Tick on Share this folder, provide a share name and set permission (if required)