Right-click the shortcut, go to Properties > Compatibility, and set it to Windows 7.
As of 2021, Autodesk has transitioned away from perpetual licensing and no longer supports the activation of versions as old as 2013. If you are a legitimate license holder, you may need to contact Autodesk support or use your archived serial numbers, though automated activation servers for this version may no longer be active. AutoCAD 2013 English Win 64bit Exe