This is known problem of bad ccd imager chip in Canon A75 camera and ccd imager will be replaced to get correct live view image.
Canon offers free of cost repair for A75 camera for bad ccd imager problem, click Canon CCD Imager Advisory for details.
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Windows 7 Starter edition comes with one desktop background, which can't be changed or customized. Please see this link for details.
http://windows.microsoft.com/en-US/windows7/Personalize-your-computer
To change the desktop background
Open Desktop Background by clicking the Start button 
, clicking Control Panel, clicking Appearance and Personalization, clicking Personalization, and then clicking Desktop Background.
Click the picture or color you want for your desktop background.
If the picture you want to use is not in the list of desktop background pictures, click the Picture location down arrow to view other categories, or click Browse to search for the picture on your computer. When you find the picture you want, double-click it. It will become your desktop background and appear in the list of desktop backgrounds.
Look for pictures in other locations on your computer
Under How should the picture be positioned, choose to have the picture fit the screen, tile, or be centered on the screen, and then click OK.
NoteIf you choose to have a centered picture as your desktop background, you can also have a color background to frame your picture. Under How should the picture be positioned, click Change background color, click a color, and then click OK.
Open Desktop Background by clicking the Start button 
and clicking Control Panel. In the search box, type desktop background, and then click Change desktop background.
Click the picture or color that you want to use for your desktop background.
If the picture you want to use isn't in the list of desktop background pictures, click an item in the Picture location list to see other categories, or click Browse to search for the picture on your computer. When you find the picture that you want, double-click it. It will become your desktop background.
Look for pictures in other locations on your computer
Under Picture position, click the arrow and choose whether to crop the picture to fill the screen, fit the picture to the screen, stretch the picture to fit the screen, tile the picture, or center the picture on the screen, and then click Save changes.
Note
If you choose to have a fitted or centered picture as your desktop background, you can also frame your picture with a color background. Under Picture position, click Fit or Center. Click Change background color, click a color, and then click OK.
Tip
To make any picture stored on your computer (or a picture you are currently viewing) your desktop background, right-click the picture, and then click Set as Desktop Background.
The Set as Desktop Background option
You can add more desktop backgrounds to your collection from the Personalization Gallery on the Windows website.
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