accessing XP machine from Vista

I have a wireless net work. I've enabled sharring (w/ full access). did the
regedit thing in Vista (LM something). turned off both windows firewalls &
norton firewall. made both on the same group. enabled netbios. and not
sure what else. On my network from my vista laptop I can see my xp machine,
but try to get access and get the access denied. I also looked for the
printer on the xp machine that I shared w/ nothing. The XP machine can see
and has access to the vista public folders but not the c drive. I really
wanted to use the printer on the XP machine and be able to share drives on
both. suggestions.