[tas]

Here's one possibility you could try:

1. Log in as 'administrator' (or some other user with administrative privileges) on your laptop.
2. Go to "Start" > "Control Panel".
3. Open "Administrative Tools".
4. Open "Local Security Policy".
5. Open the "Local Policies" folder.
6. Open the "Security Options" folder.
7. Scroll down and double-click "Network access: Sharing and security model for local accounts".
8. If this says "Guest only - local users authenticate as guest", change it to "Classic - local users authenticate as themselves" and press "Ok".

Why this may work: If your computer is using the "Guest only" model, all incoming share connections will use the privileges of the Guest user. The Guest user doesn't have privilege to access the entire C: drive. By changing to the "Classic" model, all incoming share connections authenticate as the user making the request (or another supplied username), and this non-guest user can be granted privileges to access your C: drive.

Alternatively, you could try sharing your C: drive to the Guest user. This would be horribly insecure, even if Windows XP allows it (and doesn't ignore it). Not recommended.

Let me know if this helps!