try open autocad this way Right-click the AutoCAD product icon on either the desktop or the Start menu and click Properties. In the Properties dialog box, click the Shortcut tab. In the Target field, edit the content to have the /nohardware switch at the end. For example: "C:\Program Files\AutoCAD 2015\acad.exe" /nohardware Click OK. Double-click the modified icon to launch AutoCAD. Once the program has launched successfully, undo the prior setting changes that were made (refer to product Help for information about configuring performance settings).
