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Theoretically no. For example, if you have 800X600 pixels, that's all the information you've got. You can't "create" more "perfect" pixels out of nothing and make the picture 1024*800.
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But, there're ways to "create" pixels that are "good enough, but not perfect". You'll have to use "Splines" or "Cubic" interpolation to do so.

You can do this interpolation use the applications like Photoshop, or the FREE Gimp

http://www.gimp.org/

When you enlarge an image, you have to choose "cubic" or "splines" method, that'll give you the best quality.
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But if you want something QUICK, download the "Image resizer" of Windows XP PowerToy.

http://www.microsoft.com/windowsxp/downloads/powertoys/xppowertoys.mspx

Once installed, you can resize picture by right-clicking on the picture's icon and choose "resize picture".[/url]