How do I properly transition out of NIS2010 into AVAST home edition?

Questions

New member
My trial NIS2010 on my new computer is going to expire in the next 2 days. What is the proper way to transition out of NIS2010 and into AVAST home edition without the risk of getting infected with a virus in the process or changing my anti virus solution?

I have already downloaded AVAST home ed onto my comp but haven't ran the program yet this will ensure that i won't have to connect to the internet and therefore risking getting infected.

Should i remove NIS before installing my AVAST? or can i installed AVAST first before uninstalling NIS?

What is the proper way to uninstall NIS because there are so many applications such as web update, symantec toolbar, symantec security center... etc. etc. soo yea. please help.

Does windows 7 have it's own way of preventing me from getting infected using it's built in firewalls?
 
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