what virus or trojan

I used to subscribe to a photo site clled www.dgrin.com and had posted some discussions to a forum. I received 5 responses on the 25th of Sept. I deleted the emails from my isp’s mail server. The next day, and now every time I open outlook 2002 the same 5 emails download. They are just email headers with hyperlinks in the. This happens on both our computers. I have run trendmicro, avg free and symantec virus scans and have no viruses, worms or trojans.

What is the problem and how can I remove this problem please?

Thanks
Bruce