Newbie : questions on file sharing

(sorry : I also posted this message on
microsoft.public.windows.vista.networking_sharing)

Hi everybody

I have a smal soho network consisting of a netgear router, a brand new PC
equipped with Vista Ultimate (let's call it Vista PC), and another PC using
XP SP 3 (XP PC).
The mapping of the network is OK.

after struggling a bit and thanks to the help of great people on such
newsgroup, my network is now operational.

however, I observe the following:
- From Vista PC I can access all folders and files on XP PC.

- From XP PC I can only access the folders that I manually shared, on at a
time, on the Vista PC.

so I have 2 questions :
1/
Assuming I am user "Daniel" on the Vista PC, how can I share in one
operation all folders and files in the Users\Daniel folder ?

2/
I wanted to start from scratch and deactivate file and printer sharing. How
can I do that? Indeed, if I go to Control Panel > Network File sharing, I
cannot modify the settings in the Network discovery and file sharing
sections : the check boxes are "greyed".

Many thanks in adavance for your kind help.

with brgds,
Daniel