You shouldnt need to allow anything in your router if its allowing internet access from both the pc and laptop.
Did you select the option of "this computer connects via a residential gateway" ?
Did you enable file and printer sharing on both the pc and laptop when you ran the network wizard ?
If they are both on XP then you dont need to save the settings to a floppy, thats only really for if ones on ME or 98.
I would suggest that you run the network wizard again on the pc first and make sure that you select enable file and printer sharing, then run the network wizard on the laptop again, not from the floppy, and again make sure that you select file and printer sharing.
You should also make sure that the laptop and pc are also members of the same workgroup, usually MSHOME but as long as theyre both the same it should be ok.