HI
Difficult to say what might be the problem here as it's most unusual for video clips not to export and not play.. What version are you using? What happens when you just add two or three video clips and a couple of images to the timeline.....do they export and play OK?
The best way to resolve this is to upload your project to Dropbox or equivalent.
Open your project in VP and from the File Menu Save Portable Project As...

Navigate to a suitable folder (or choose Desktop) and Click Select Folder. All the component clips and a vpj.exe file of your project will be copied and saved to a dated folder.
Upload this folder to dropbox and make it public.and someone on the forum can take a look and see what might be the problem..
Nat