Web Site Log in issue with only one profile

When trying to log into the backside of my web site(Joomla)  to enter product, change pricing (etc>) I am not able to log in under one particular profile(the profile on my XP machine, not on the web site) on my XP machine. If I log off of that profile and on to another (on the same XP machine) I am then able to log in to the backside(Joomla) of my web site. Any Ideas?
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Panagiotis Sweb developer - designer Commented:
there is nothing to do with joomla user management and windows

there must be something else or your profile security disables you from login to specific ports etc

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