I am going to assume you bought this laptop recently.
Windows 7 is a little different from XP. Instead of getting "Properties" you get "Personalize" when you right click on a blank space on the desktop. Windows 7 gives you many choices. If you want to have your own background just click on "Background Images" and find your image.
Not at all.
1012
percent of 1012 = 101200%= 1012 * 100%= 101200%
1012 pennies is £10.12. If you meant 1012 this is 1010 or 10,000,000,000 pounds
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1012 + 13334333574 = 13334334586
1012 506,2 253,2,2 23,11,2,2
46
2 * 2 * 11 * 23 = 1012
1012 is an integer and cannot be simplified further.
0.09 x 1012
5.0009 x 1012 = 5,000,900,000,000