HI , i have a Canon Camera 1202 powershot A75 3 years ago and it was working properly till I came to USA . From that time on , when I connect my camera to PC it doesnt recognize it and i cant empy the memory and take a picture . please tell me what I can do ?

Consider NOT connecting your camera to your computer.

The best way to download pictures from your camera to your computer involves removing the memory card from the camera and plugging it into a card reader (either built-in to the computer or connected via USB or FireWire). This is likely to be faster than connecting the camera to the computer, and won't run down your camera's batteries.

Once the card is plugged in, it will appear to your computer as a removable drive. You can use the operating system's drag&drop facility to copy pictures from the card to the computer's hard drive. Or you can use any photo cataloging program.