My disk defrag wont open. Only message is that it cant start. Probable cause Virus? What should i do?

Hello, Please understand that we mainly discuss Exchange issues in this forum. I suggest writing a post on the Vista forums: http://forums.microsoft.com/technet/default.aspx?forumgroupid=204&siteID=17 If youre using Windows XP, refer to the following link: http://www.microsoft.com/windowsxp/expertzone/newsgroups.mspx Thanks, Elvis