iYogi's contracted 3rd party support has been terminated by avast some time ago, some support staff hard selling their own support package. So unless you actually have an iYogi support contract (mega bucks), then these forums are your best option (even if iyogi were still doing avast support).
I'm guessing here, after your computer wipe you want to install avast and want to know if your license is still valid ?
If so check this - 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.