One of our staff asked me to look at her Advent 4213 netbook. The HDD has had it and the XP Home COA is rubbed away so there is no key. When I told her how much it would cost to put right she said it wasn't worth it and gave it to me. I have a spare drive I can use and XP Home on a bootable USB but without the key it's not a lot of use. I'd like to get it going for my granddaughter to use, whilst spending the least amount of money. Any recommendations please.