Hmmm, my fully up to date McAfee and XP did not catch it, thanks McF and M$, luckily I had just changed to Kaspersky and it found it straight away !
Auctiva is still a great site to work with, won't put me off. However it confirms my change of Anti-Virus software was a good one even though it was driven by cost, the bloated size of it and the cpu power consumption.