Vista laptop cannot access other XP PC & Shared printer

> Hello,
>
> I had purchased a new laptop running Vista Business edition, with Norton
> Internet Security. There are 1 desktop & 1 laptop running XP Home on the
> network.
>
> I had installed the LLTD Responder into my XP Desktop and laptop already.
> The XP Destop & laptop can see my Vista laptop in the network.
>
> In the Vista laptop, both XP Desktop and laptop can be shown on the network
> mapping, but cannot access. I use the mouse pointer to click both XP Desktop
> and laptop icon, but no response at all. Also, I try to add network printer,
> but the Vista laptop cannot detect my shared printer, which is connected to
> my XP Destop.
>
> I checked the exclusive list of the firewall already. "File and Printer
> Sharing" is excluded. The workgroup name is all identical for these 3
> machine. I tried many times but still cannot fix this problem, which make
> me extremely frustrated.
>
> Anyone can give me some advise?
>
> Thanks and regards,
> Zeeman