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A stuck shutter is another common failure mode for digital cameras. The symptoms of a stuck or "sticky" shutter are very similar to CCD image sensor failure. The camera may take black pictures (for shutter stuck closed), or the pictures may be very bright and overexposed, especially when taken outdoors (for shutter stuck open).
To confirm a stuck shutter, put the camera in any mode other than "Auto", and turn the flash OFF (you don't want to blind yourself for the next step). Next look down the lens and take a picture. You should see a tiny flicker in the center of the lens as the shutter opens and closes. If no movement is seen, then you likely have a stuck shutter. If so, please see this link for further info and a simple fix that may help.
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, the same way you copy any other files. Or you can use any photo cataloging program such as Picasa.
For the best photos of close-up it is recommended to use a tripod since the Canon A620 has no image stabilization. You can then use the macro setting and set if for the distance you will be shooting from and your photos will be a great clearer and with no blur
As simple as this may sound, have you cleaned the lens lately? A lot of image quality deterioration comes from a finger print or other smudge on the lens. Digital cameras are succeptable to even the smallest gunk on the lens. Because the lens element is very tiny, use a cotton swab with a drop of lens cleaner (or isopropyl alcohol) to thouroughly clean and dry the lens. If it isn't a dirty lens, check your file-size and flash settings.