It sounds as if the photos are still on the memory stick.
That is good.
Do not take any more photos on that memory stick until you recover them.
To recover them you will need a memory stick reader.
You can buy them at any store that sells digital cameras ($20).
Then you need some recovery software.
There are literally hundreds of good memory recovery software programs available.
Here is a link to several hundred:
Choose a program and run it.
I have a sony cybershot DSC H7 digital camera with 8.1 MP, and a 1 GB memory card. Yesterday while the camera was connected to the friends computer, a message came there is a virus and the virus was automatically deleted (Trend office micro scan ), since then I am not able to read the pics from the card. The card can even though be read by the computer but it reads it as blank. The photos are safe in the camera and can be seen when reviewing and also the property of the card show space occupied by the card. I have tried it many computer but the problem persist. Can anyone help me restore the pics ?