Question Author
Thanks again or the poll Ed.
I'm leaning toward unistalling Norton and buying it again as a new customer. Best price around is about £25. I've always been really happy with it but reluctant to pay the renewal fee of £65.
My second choice was to be MSE but I read this today and lost my nerve.
Installing the free Microsoft Security Essentials will protect your system from malware—to a degree. But you'll get better protection from one of the other well-known free anti-malware products.
Thank you to everyone who responded to the poll and who gave their experiences, its been really useful.