I recently installed the free version of DraftSight 2015 and everything seemed to go fine until I attempted to use the program.  Upon opening the program a dialogue box opened with the error message, "Entry Point Not Found - The procedure entry point DwmInvalidateIconicBitmaps could not be located in the dynamic link library dwmapi.dll"  After acknowledging this message by clicking the "OK" button, the program opened, but would not respond at all.  I tried re-downloading and reinstalling several times with same results.  How do I solve this issue so I can begin using the program and see if it meets my needs?  I need to solve this ASAP, any help would be appreciated.  Thanks.