Install Sequence ? NIS, NU, Ghost

I am about to run the NRT to purge my system of NSW2009 that will not uninstall using add/remove, the NRT as I understand will also remove my NIS2010....so after removal of these I will be installing NIS2011, NU, and Ghost.

Is there any particular sequence I should follow in installing these 3 Symantec programs ?

 

One more question, If  NRT uninstalls my NIS2010, do I have to reinstall NIS2010 to be able to upgrade to NIS2011 or can I just go to the NIS upgrade page and do a clean install of NIS2011 ?

 

My reg code is valid to June 2011 !!

 

Thanks,

BY