hi,alistu,actually,what i did is very simple.I try to creat a new optisystem project in the desktop,but failed(as the picture i ever attached before),and now i do the job as followed:
1 start optisystem 7.0
2 click ‘file’menu
3 chose’new’
and a new project was created.
although the problem is solved,but i still confused why,could you explain it?,thank you,my friend!