Sony cyber-shot dsc-w55 memory stick problem. Once i erase the pics through the comp. the memory stick still shows that is full. I have a SanDisk 2.0GB memory stick ProDuo. What can i do?

After connection with computer the camera do not show the auto run process

You need to check again how you are erasing with the PC.Try opening the the memory stick folder on your pc, and deleting some shots one by one.You should be asked each time to confirm you want to delete.You can then check if they have actually been deleted by looking in your recycle bin.
I don't ever clear the memory stick of my cybershot outside of the camera. After download, I delete with the camera.That way I know my card will stay properly formatted for my camera.