Welcome to the Forum
In addition to Marc P's Post above, please confirm the following:
I save all my project in C:/My Document/My project
Studio's Default Location for studio Projects is: My Documents / Pinnacle Studio / My Projects. Please confirm whether or not your Project is in that Folder & that you have a Grey "Film-Strip" Studio Project Folder, together with it's associated .stx File Icon, with the same Project Name as the Project Folder, that Opens the Project Folder into the Timeline.
If you have the Project Folder, Right-Click on the Folder / Properties & Post how many Folders, Files & Size in Mbs, are shown.
Thanks
ADDED - I've re-read this quote:
the whole project loading nomal to the timeline but all scenes turn in black when I click to each scene to review all I can see is a Black screen and ! in the midle of the screen,
I initially thought that you had black thumbnails showing in Timeline, but it seems that you have correct thumbnails showing, but Preview Screen has a blue exclamation mark?