A. MS Paint is a basic drawing program that is a part of all Windows operating systems. It should be located in the Accessories list following the path Start > Programs > Accessories > Paint. If it is not listed, it simply hasn't been loaded and this can be done easily in the Windows Setup portion of the Control Panel.
Start > Settings > Control Panel > Add and Remove Programs-Windows Setup tab > Accessories > Details. Scroll down the list until you see Paint and click in the box beside it to place a checkmark there. Click OK and depending on how the operating system was installed on your computer, you may or may not be asked to insert the Windows CD.
 

A. Follow the path Start > Programs > Accessories > Paint to get to MS Paint. Open your .bmp, .jpg or .gif file, click on Image > Attributes or press Ctrl + E. In the Colors panel, select either Black and White or Colors. When Colors is selected, and Color Box on the View pull-down menu has a checkmark beside it, the Color Box, or palette, shows across the bottom of the screen. When Black and White is selected, black, white and patterns of black and white show on the palette. If you see no palette, click on View and click beside Color Box or press Ctrl + L.
 

A. There are two layers of color-foreground (lines, borders of shapes, and text) and background (inside of enclosed shapes and background of text frames). Left clicking on the palette colors changes the foreground color chip, while right clicking on the palette changes the background color chip. The same clicking procedures apply to the Black and White palette. The two color layers are shown in the large square at the left end of the palette. To apply a new color, click on the Fill tool (paint can) in the Tool Bar; select the new color; then position the paint coming out of the can in the area to be colored. Click and the new color will fill everything within the outline selected. Clicking directly on a line will change the color of the line and any lines with which it comes in contact.

The background color is the default color for the Eraser tool. If you're working in Black and White, erasing can be done either by selecting the Eraser tool or by selecting the background color and "painting" over the error.

If you don't like something that's happened, it is possible to Edit > Undo up to three times.
 

A. Under the View pull-down menu, click on Zoom > Custom and select a larger percentage. For me it is easier to work with individual pixels at 600% or 800%.

When I have worked with a photo trying to paint something out of the picture or repair it, I usually work at 100% or 200% using the Pick Color (eyedropper) tool to match another part of a picture and then using the Airbrush (spray can) to paint over the unwanted part. This works well to remove blemishes in photos or toys from the floor, etc.