Very interesting replies to my post, thank you. Where I was caught out was that this was the first time I had ever encountered this problem and what exacerbated the situation was that once Norton had told me that my new exe file was "suspicious", it also told me that the file was too large to quarantine and it promptly deleted it before I had chance to gather my wits. Fortunately all my previous shows were backed up on an external disk, but my latest, (which was a memorable trip to South Africa!) had been destroyed. This meant starting all over and making a new show. We sometimes learn the hard way!!! I had previously used earlier versions of P2E without any trouble, but my problem arose when, coincidentally, I installed Norton 2010 and P2E 6 within a day of each other. Hence I wasn't sure which was the culprit! I have since run my slide shows successfully making sure that I was off line. I have yet to try excluding my P2E folder from being scanned. It would be interesting to hear from Norton but I won't hold my breath!