we are running small business server 2003 and we think we may have a virus but can not identify what it is and anti-virus can not find it. we have many old files that have layed doormat for many years and we were accessing them recently when cleaning out our server. then a week or two later these files will disappear and sometime even be under new names when we find them. it has only effected word documents and jpg images so far. if anyone knows what this may be any help would be appreciated.