No memory space on internal memory. How do I fix

It is not only the card and computer or camera and computer that is needed. To interface anything to a computer you need a program. Most of the time called a driver. When you put a card reader to the computer, or when there is a card reader in the computer you need a driver that came with the card reader or the computer. To read from a camera, you need a driver that came with the camera. More and more, the interfacing of cameras becomes standard, so if you ever installed a camera driver it could be other cameras can communicate with your computer. But no guaranty it always work.
With the correct driver, your camera acts like an external memory to the computer and the computer can read the pictures on the memory card in the camera.
So if you use a card reader or a camera on the computer always meme sure you have installed the correct software that came with the apparatus.

Use photo recovery software is one of the best methods help to recover your lost or deleted photos, pictures, easy and guaranteed.
More tools: car data recovery

You can remove the memory stick from the camera, look what model memory stick it is, then go to radioshack or search online (such as amazon) for a usb converter for your model memory stick. usually they are cheap between 5-10 dollars and you wont have to plug your camera directly into the computer.
Here is an example of one that would work with your style sony camera.
http://www.buy.com/prod/iogear-12-in-1-pocket-card-reader-writer/q/sellerid/11408470/loc/101/208180190.html

Remove the card and place it in the card reader of the PC. Now try for a scan - hope you have a good active antivirus installed.
If the scan detects , the copy relevant files to a folder only if you require them . If not FORMAT the memory card and clean the memory. Now check the properties of the card for the full space before you set this back to the camera.

try to go to menu settings/options.. and find a keyword that related to the word "Save". then find a settings that you can choose if where the image save file directory..

Remove the memory stick ,do hits on the lens side the problem will be fixed

you should open the mass storage device and open its contents your pics should be in a DCM file

there may be two problems. 1. Format your card before using it. 2. Switch your storage device to memory card and it will work. Hope it works..:))

DSC-T1 model has no internal memory and it requires memory card due pro to store pictures.

Before anything else try to reset all from the menu for the internal settings. This may get the camera back to where you will see the format option.
Make sure you format and delete all that is in the internal memory. This may be due to a full or corrupted memory space internally.

Because the camera can work with the memory stick, it seems that there is some problem with the memory internal space.
Try the format as mentioned above. Some cameras will only allow you to delete all in the internal memory.
Go to the menu and look for format the memory, and remove the card so that the internal memory will be defaulted.