Completely removed 2008 which had become

Completely removed 2008 which had become corrupted. Now 2009 won't install correctly. Program asks to allow it to search for data files. It finds but can't open. Or it may opens up and I see file on screen for 2 seconds and the program shuts down. I was able to open one six month old file but can't open anything more recent. Tells me it is updating 2008 data into 2009 and although that is accomplished it still won't open. Program just keeps shutting down.