I use Microsoft Visio to design Traffic Control Plans for my business. Monday am I could suddenly not open any file including ones saved on flash drive. I have had 2 services look and we have uninstalled reinstalled did repair etc nothing works. Files say Corrupted how can 100's of files be that way. I noticed something when I was playing with it because it will open new sheets to draw on only to be "corrupted" as soon as saved and closed. I usually name them MHT #etc. If I name them drawing 1etc I can now open my new ones. Anybody out there use this program. I use Windows 7 Home Premium.