Hi,

I got a Demo version MStudio for plotting, but it cann't save. Now i find a 'Call ..' which causes error information, unfortunately, this 'Call ...' has been carried out many times, i wonder how to reach its last turn. To be honest, I lose confidence in cracking it. So i am looking forward your kind help.

P.S. the download address:
http://www.quantsims.com/Software/index_mstudio.htm

3 ways jump to mind: Either BPX the message box using SoftIce which will give you the caller, and trace back the stack from there. Do a BPX on DestroyWindow and trace back from there, use W32Dasm, load it into the debugger part and set a break and then trace back the stack in that.

Alternatively, look for a JNE or JE near the PUSH or MOVE for the error message text.

NB: If the program can't be registered from itself, and the programers who did the protection arn't stupid, then the chances are there will be no save code so you'll have to create your own