Recently getting error onaccess to internet

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Not sure this is the right place to post but I recently built a new system
with Intel bx2 with onboard Ethernet.
I just changed isp and since about then(?) I frequently get the error "might
not be able to access internet- - problem occurred network did not assign
address to comp" I then have to perform a repair before I can make
connection. I am not sure where or what to look at and cant find an answer
at msoft site. any ideas or pointers please? tia.

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