Can't reload 'C:\Program Files\MATL​AB\R2015b\​bin\win64\​sl_graphic​al_classes​.dll' Message error

Hi, I just install matlab R2015b. My window version is window 7 and 64 bit. When i try to open simulink, the message "Can't reload 'C:\Program Files\MATLAB\R2015b\bin\win64\sl_graphical_classes.dll" is pop-up. How i want to solve this problem? I'm searching this solution in search engine but there is no answer. The sl_graphical_classes.dll file available inside the folder directory. Thank you.