I deleted Photos from my 2G Memory Stick Duo on my computer, now the camera says there are no images but has only 100mb memory space available

As a last resort you could copy the full card to a computer and then delete the pictures on the card and use that again.

Here is the error list from the camera manual.
This is all I can suggest from here.

"Reinsert the Memory Stick Error"
•
Insert the "Memory Stick Duo" correctly.
•
The inserted "Memory Stick Duo"cannot be used in your camera
(See below).
•
The "Memory Stick Duo" is damaged.
•
The terminal section of the "Memory Stick Duo" is dirty

Compatible cards.
Memory Stick Duo (without MagicGate)
Memory Stick Duo (with MagicGate) *1 *2
MagicGate Memory Stick Duo *1
Memory Stick PRO Duo *1 *2
---
NOT compatible
Memory Stick (without MagicGate)
Memory Stick (with MagicGate)
MagicGate Memory Stick
Memory Stick PRO
----

Some Memory Stick Duo have a write protect switch on the back.
You cannot record, edit or delete images if you
slide the write-protect switch to LOCK with a
fine-tipped object



*1
"Memory Stick Duo", "MagicGate Memory
Stick Duo" and "Memory Stick PRO Duo" are
equipped with MagicGate functions.
MagicGate is copyright protection technology
that uses encryption technology. Data
recording/playback th
at requires MagicGate
functions cannot be performed with this
camera.

*2
Supports high-speed data transfer using a
parallel interface.

DEAR SIR,

if you are sure that u have copied images on UR pc then FORMAT UR MEMORY CARD .. IT MAY SOLVE UR PROBLEM .

Try to format the drive from your computer, instead of just erasing it. Also, memory cards do go bad too.....some times quite easily.

The good news is they are VERY inexpensive now of days if you do need to replace it.

Unable to transfer a video recording made on the hard disk drive to the Memory Stick Duo™ media Solution
Do the following before attempting to copy movies to the Memory Stick Duo media:

1. Ensure an Image Database File has been created on the inserted Memory Stick Duo media.
2. Ensure there is enough space available on the Memory Stick Duo media.

NOTE: For model-specific information about how to transfer a video recording, refer to the operating instructions supplied with the product. Manuals are available online in the Manuals/Specs/Warranty section of the Sony® eSupport Web site.

If you put the memory stick back into the camera can you see them thru the camera menu? If so your computer's SD card port may be having issues. try using the card in another computer or use the cameras USB cable to transfer the pictures from the camera to the computer if it has one. Do other memory sticks work in the computer ok? If you cannot see them in the camera either then the pictures will be corrupted and probably cannot be recovered. Then the card will need to be formatted to erase any errors on the card. Always use the camera to format a card whenever possible...Hope that helps.

in your settings is it set to "shoot without card"? this could cause the camera to not use the memory card installed and rely on internal memory which is limited

Transfer the images from the memory stick to your computer, make sure the transfer has been successful so you don't lose your pictures, then to be safe put the stick back into the camera and delete them once back in the camera. AGAIN, before you delete anything, make sure your pictures have been safely transferred to your pc and you can view them all. Deleting the photos from the stick will make the disc empty again and ready for more shots to be taken.

move the auto install file then reformat the flash drive as fat.

Yeah, all you have to do is delete all the pictures on the card. It's easiest to do on your computer, not the camera. Just put the memory stick back into your computer and find all the pictures and select and delete them. If you've already transfered them to your computer then don't worry about it. If you delete the photos off the stick, they will NOT be deleted from your computer so just go ahead and do it.

You should be able to transfer the images directly to your computer without transfering them to you memory stick duo. Have you tried connecting the camera to your computer and retrieving the images? If you would rather have the images on your camera on your memory stick duo, then remove the memory stick duo connect the camera to your computer, copy the images off of the camera, turn the camera off, put the memory stick duo back into the camera, plug the camera back in, then transfer the images that you just transfered from the cybershot to your computer back to the camera. They should copy directly to the memory stick duo.