s7tcp32.dll not loaded error 0x000000c1

s7tcp32.dll not loaded error 0x000000c1

I have this error on when RT start; I  changed  HMI with  WinCE 5 to one with  WinCE 6, transferred RT files from PC (with Update Windows CE Runtime) but I have some images (animated by a variable) not displayed.
How i can resolve it?