Okay, if Word is what you have, then we'll do it with Word! It does have some simple text distortion capabilities. Many of the designers who frequent this board will cringe, but that's fine, it's their job to hate this stuff
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I'll note first that if you have Word, you probably also have a font on your system called Arial Black, which may already be wide enough for your needs that you don't have to do anything unusual. you will want to check it out before getting into what I describe below.
Anyway, on to the text distortion atrocities!
Create a new Word document, and in the View menu, turn on the formatting palette. Click on the rightmost tab in the palette, the one marked 'W', this is what they call Wordart at Microsoft. (You can also check Word's help for more details)
For what you describe, the outline template should work, drag it over to your document. It's this one:
It's now outlined with little sizing squares that you can use to stretch the text however wide you like. Double-click it to change the text.
Go ahead and make the object large, because your final product for other apps will be a bitmap image. The more pixels you use to make your shape, the less trouble you'll have with jaggy edges. Programs like Illustrator can avoid this problem, but I'm trying to offer you something here that will work with the tools you have
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Back at the bottom of the formatting palette, you'll see weights and fills. You can use that to turn it into solid text, whatever shade you need, and so on.
From now on, you can copy and paste the finished text wherever you like, even outside Word into other applications, including TextEdit or Pages. (It will really be an image, not text, when you paste into other programs.)
If you would like to save it as a separate image, you can do that too. Copy the Wordart object as before, open up the Preview app, and pick File->New. You can save it in whatever format you like.