I'm running a dell 3100 with windows XP professional SP3. I have been using without any problems the NTBACKUP program provided...until today. All of a sudden it has stopped working. I can see it as a process in the processes tab of Task Manager, but it is not in the applications tab. I have recently installed Office 2010, but NTBACKUP was working after the install so I do not believe this to be the problem. I've searched the web for some answers but most want you to download and install the NTBACKUP.MSI file, which I have done. I do not have the original OS software as XP was installed on the computer at purchase. Any help out there?