How to resize a photo using paint
Open Paint by clicking the Start button , clicking All Programs, clicking Accessories, and then clicking PaintClick the Paint button , click Open, click the picture you want to re-size, and then click Open
On the Home tab, in the Image group, click Re-size.
In the Re-size and Skew dialog box, select the Maintain aspect ratio check box so that the re-sized picture will have the same aspect ratio as the original picture. If the Maintain aspect ratio check box is selected, you only need to enter the horizontal value (width) or vertical value (height). The other box in the Re-size area is updated automatically
Do one of the following in the Re-size area, and then click OK:
To re-size your picture by a certain percentage, click Percentage, and then enter a percentage to reduce the width by in the Horizontal box or a percentage to reduce the height by in the Vertical box.
To re-size the picture so it's a specific size, click Pixels, and then enter a new width in the Horizontal box or new height in the Vertical box.
Click the Paint button , point to Save as, and then click the picture file type for the re-sized image.
Type a new file name in the File name box, and then click Save.