To see what's in the trash:
Launch Terminal and copy & paste these commands:
Then enter ls Press return
This will list of the contents of your trash, so you can if there's anything you need you can drag it out. If not, follow these instructions:
Go to /Applications /Utilities/Terminal and launch it.
At the prompt, copy and paste this command
sudo rm -rf ~/.Trash
You will be asked to enter your admin password. It will be invisible.
Enter it and press Return.
Log out and back in or restart.
Let us know.