Losing Local Profiles – Power Users

After installing WinXP Pro and setting up network settings to attach to a Win NT 4.0 network using Domain login, I lose the local Power User profile. I do not use roaming profiles. Have installed WinXP Pro on 4 workstations, no issue. Installed same user on new computer using same WinXP Pro CD. After saving several desktop changes and mapping 4 drives seems to start loosing local Power User profile. My Admin profile remains intact. What am I missing? Thanks in advance for the help!