What to do when something can not found?

Hello,

My last edition of X5 shows an error, so I decided to replace it with X6. Unfortunately even I have tried for more than 6 times, it keeps shows dialogue box that says:

'Cannot find 'pcucmd://FrameLoaded/'. Make sure the path or Internet address is correct'

Is there anyone can help me? I need to resolve this problem as fast as I can, since my work is awaiting :(

*I uses Windows 7 Ultimate and have enough capacity