1) I use a 6GB system partition just so I can have a 1GB swap file and 1Gb for hibernation
2) Program files - I wouldn't do it
2) My Documents yes. Right click My doc from explorer and select 'Properties' then 'Move'
3) Right click the folder to share, click 'Sharing' Use the instructions there. You can do it manually as well but it's so long since I did it, I can't remember the security messages you get along the way son won't even try.