It didn’t, all I got was this:
"Dear customer,

we are sorry, but our records show no valid purchases with the e-mail address you specified.

Please make sure the information you supplied is correct, and the original purchase was carried out using this email address.

If you purchased your license from an Avast reseller please contact the reseller directly (http://www.avast.com/locate-dealer).

Best regards,

the Avast team"

I paid £14.99 direct to Avast on debit card for a 1-year licence just a few days ago. However like the OP a PC crash necessitated me reinstalling Windows XP Pro and Avast Cleanup thinks mine is new machine, it isn’t.

Any way around the problem?