How do i change the movie resolution canon a510

You cannot. Your camera is far too sophisticated and its sensor produces high resolution images, so to hope it can produce low resolution 320 x240 images as streaming video is not realistic.

You may download the manual and more from the Canon website here.

You can use any size SD card. Just keep in mind that SD cards max out at 2GB; any larger cards are actually SDHC cards and will not work in the A510.

Try going in settings and checking the option "Record Sound" :)
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Just to the right of the viewfinder is a silver button with a red dot in the centre. This will start / stop recording. Set the camera dial to Auto, press the red dot button, and your recording will start. When ready, connect the camera to your computer with a USB cable and the movies will download at the end of the still pictures.
You might find recording suddenly stops after a while - this is because of a size limit for movie files. You can get over this by changing the resolution that the camera records at. It's quite complicated so I suggest checking the user manual or downloading it from the Canon webiste to choose what quality if resolution to use.

well giving it a tap/thump it might have a dry joint ....

Have you used this card in the past? Is this a new card?

Is this card rated to be used with this camera. Some cameras can only support cards of certain sizes.

If the card is compatible, take the card to target or best buy and format it on a camera there and see if it works then put it back in your camera and see if it works after.

can i use canon power shot a510 how web camera??

To change movie resolution:

1. Set control dial to movie mode
2. Press the Func/Set button
3. Scroll down to the recording pixels icon (probably 320 on yours right now)
4. Use left/right arrow to select 640
5. Press Func/Set button

go to camera mode... press function...scroll down to the S symbol...and select the desired resolution