I used DXSDK of Aug.2009 and Max 2010 as creation tool. It worked fine. For some legacy code, I installed DXSDK of Feb.2007. After that every time i launch max, it will popup a warning box to notify pre-release directx sdk d3d10d.dll has been expired and new version DX need be installed. I can't still use max, but don't feel comfortable. I uninstall SDK of Aug.2009 and install Feb.2010. The issues remains. Do i have to uninstall Feb.2007, too?