I have a newly upgraded computer(just got it back and it now has windows 7 had windows xp.
How do I check it now to see if avast subscription is still there and if not how do I move it to this (new) computer)
Install the paid version of Avast you require and reinstall the license file from your email or where ever you saved it, if you only had the free version previously installed then re-install it and register through the UI “user interface”
If you didn’t save your previous license, try the Resend avast License http://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.
This assumes that by ‘subscription’, you are using one of the avast paid versions and subscription=license.