I have a purchased license for internet security, i need to format my PC and start fresh just wondering if i will be able to use this license on the fresh windows? what do i need to do to reinstate this license after i wipe windows and start over?
Yes you can, provided it is still valid (time left) you need to save the license.avastlic file so it can be used again.
You can also use the Resend avast License https://www.avast.com/resend-license-paid.php, you will need to enter the email that you used when purchasing the license, e.g. the one that the original email with the link was sent.