Can you try to describe your problem better?
I now read
- you imported photo's from SD card
- they show as photos through Picasa3 or Paint
- but they don't show as photo's if you try to see them as photos
So all I can say: use Picasa3 or Paint to show them as photo's and it's OK.
And you tried on another computer. It was the same. But how could these photos or pictures or thumbnails or whatever you imported ever come into that other computer if you deleted them while importing them on the first computer?
And can you tell what's on the hard disk. The average picture is 1 to 2 megabytes, easily seen in My Computer. Thumbnails are either small (a kilobyte or so) and not separate files (all are included in one file, called thumbs.db).
Kees
I have tried looking at them on another computer and the same happens.
Is there anyway I can have full size photos of these thumbnails?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic