Beta 1.7/1.8 unable to open

Installed Beta 1.7 and started new project. Dragged in large Doc file to Research folder and was informed it was being converted to RTF. Tried to view that file and then program crashed with Windows message re encountering unexpected problem and needing to close. Since that time every time I try to open Scrivener I get the same error message. I have tried uninstalling and then reinstalling; I have downloaded and installed beta 1.8 through liveupdates and still get the same message. I also downloaded and installed the Visual C++ as suggested for XP users but to no avail. I assume something somewhere has been corrupted but am at a loss as to where it is.

Thanks for any help.