Thanks for your reply isi3000 I downloaded the free version, alas picked no nasties up. I have an update to this problem. While looking at my temp internet files I noticed that the offending file. File Type:: FireFox document, size 1KB with no expires date.
Stckyb: Have had reply from the hosting company they seem most concerned and have asked me to forward more details such as what AV I'm using.
Daz