I have an AD and have added a batch file into the sysvol and edited the users profile. The batch maps a network drive on login. Sometimes it maps and other times it doesn't and i'm not sure why. I have laptops and i was wondering if this might be the problem. The laptops are syspred but when they are being built they use the the naming convention XP- mac address. We do not use the wireless connection only the oboard nic card. I have noticed that in the AD under computer accounts they are installed with the xp-mac address for the wireless card. Do you think this could be a problem or is it more likely to be a dhcp error ?