User gets Temp profile?

I have a winxp sp 2 box on a domain. A user logs into the domain and will
occasionally not receive their normal desktop. They receive a default users
profile. However when you browse to "C:\Documents and Settings\" folder the
only sub-folders that he can access are his domain profile [username] and the
temporary created "Temp" profile. Subsequent log offs result in the same
desktop. Only rebooting the machine will typically reset the logon account
to be the users normal logon profile ie:[username] I am perplexed as to what
would be causing the box to use a Temp profile. Roaming profiles are not
implemented. User is a Power User.. ieomain Users is member of local Power
User group.

Any ideas as to a solution on how getting it to logon with the same user
profile are appreciated.

Tim Fitch