re-install Norton...re activation

hi evry one ...I have been involved recently in the services Norton ...

 I have purchased a product key ( 1 an for 3 PC ) And I use it on three different computers.

 I want to ask ...

 If there is corruption in my windows ... and there is no solution ... just re-install Windows ... In this case, re-install Norton. And use the old product key (6 month still) ... Does this cause any problems? .