I am running a computer with Windows 7 (32bit) with AutoCAD 3D 2011 and Autodesk Design Review 2011. Sometimes when I try to publish a dwg to a dwf or when I am using the "markup manager" to overlay a dwf file into a drawing my computer will completly freeze and the only way to stop this is to do a hard shut down of my computer. The computer is a hp and was purchased in February of this year. Has anyone else had this problem or can help me please?