Tried the simple stuff yet? like making sure you can connect to another share on the remote computer, try creating another share and connection to it using your admin credentials, i remember when i started playing with windows shares that i had left my firewall on and it was blocking the traffic, with the way i set my rules it refused to let the data through so if you have a firewall switch it off and try again, don't forget if your running WinXP with SP2 the firewall is on by default and i don't have a machine handy to see if it blocks SMB access by default.