Hi to all..
After 4 days head-shacking I found a solution for my problem with nokia 6680 and pc suite...
If you install the sofware and drivers and seems to be all right but when you try to install apps or transfer files from and to the phon you get the message "Impossible to complete the operation", you just have to click on start -> run -> and write regsvr32 %windir%\system32\ole32.dll
So the Object Linking and Embedding library will re-register on your system and all wil work fine!
I hope this will be usefull for someone 😉
Bye!