A few weeks back, we started getting reports of an issue in which CorelDRAW Graphics Suite X4 applications would not start after Autodesk Inventor, AutoCAD Mechanical 2009, or Microsoft SQL Server 2008 was installed. Hot-fix 1, which will also be available shortly from Corel.com, resolves this issue. In the mean-time, here is the link to download it.
Gérard