Scanning a customers HDD NOD32 2.5 beta detected "E:\CDROM\CYBEC.DOC - probably a variant of WM/Nuclear.D virus" on a scan operation. The file was not cleaned, modified or altered in any way I've been able to discover however it is now undetected by further scans. "CYBEC.DOC is a Microsoft Word document which will remove the WinWord.Concept Winword.Nuclear.A and Winword.Nuclear.B virus from your Word documents. The WinWord.Concept virus is also known as the Word Prank virus." Any suggestions - has the beta got some kind of AI for fine tuning its 'probable' detection?