1. Control Panel>Windows Firewall - uncheck File & Printer Sharing. If
using
a third-party firewall, disable sharing from within that program. If you
previously created shares, go to them, right-click on them, and mark them
as "do not share".
2. Create strong passwords on all accounts, including the built-in
Administrator account. Write them down somewhere! To access the built-in
Administrator account in XP Home you will need to go into Safe Mode.
3. Make other users Limited accounts.
4. XP Home doesn't have the ability to set fine-grained permissions and
restrictions that XP Pro does. Either upgrade to Pro or use something like
MVP Doug Knox's Security Console or the MS Steady State to give you more
control.
http://www.dougknox.com
Steady State -
http://www.microsoft.com/windows/products/winfamily/sharedaccess/default.mspx
Malke