Helping people with computers... one answer at a time.
Windows is highly customizable. The fonts that it uses are one of the items that you're actually given a fair amount of control over.
Can I change the font that is used on the screen? For example can I make it Verdana, Trebuchet MS, Georgia, or any other I could name? It probably has to be a True Type Font. What is the name of the font that is normally used with Windows XP Professional? Thank you for any suggestions you may have.
This is one of those areas where I typically recommend people not go playing. Not because it's dangerous, but because it is an area that Microsoft has done a lot of research into determining and developing a look, including font, that seems to be the most effective for the most people.
But of course, what if you're not "most people"?
Then there's a lot you can fiddle with.
I do need to point out that if all you're trying to do is make text bigger, there's a different, simpler approach outlined in How can I make the text on my screen larger?
To start, know that font used "on the screen" is actually several separate settings. The text in a menu might be different than the text in a window caption and those might be different than the text in the content area of a window. If you want to change them all and have a consistent look, there's a bit of work ahead.
Right click on your desktop and click on Properties and you should get something similar to this:
Click on the Appearance tab to get this:
And finally click on the Advanced button for this:
To get to this same dialog in Windows Vista:
Right click on the desktop
Click on Personalize
Click on Window Color and Appearance
Click on the Advanced button
If you now click on the drop down list labeled Item: you'll see a list of items that should be similar to this:
These are the items whose appearance you can control. If you click on one of those, then the nearby controls labeled Size, Color and most notably Font, among others, will enable if that setting can be adjusted. For an item where the fonts can be selected, you'll see that the Font drop down list is most likely chock-full of fonts for you to chose from.
Be careful! You can certainly select a font that, if accepted, could render all your text unreadable. Take a little time, experiment a little, and see what works best for you.
In most cases, what works best is, of course, doing nothing.