In Windows 7 Pro, Illustrator CS5 suddenly will not open. It gets as far as displaying the App window then freezes. I have tried deleting all third-party plugins. It shows up in Task Manager Under "Processes" but NOT "Applications". I can "End Process" here, as well as simply clicking on the frozen App window in Explorer. Any ideas would be much appreciated. It seems to me I recall having to delete and reinstall all Microsoft Visual C++ Redistributables, but I can't remember why. (DUH!) Thanks!