Select Start>Settings>Control Panel>Fonts to open the needed system folder.
Select File->Install Font to open a browse dialog.
In the dialog, locate your downloaded FONTS folder.
Click Select All button and then OK.
Close the window displaying ...\WINDOWS\FONTS folder.
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Step 2: Editing the company name
In this step you will learn what layers are and how to find the one that you need. You will edit text on the layer and change it's position.

Double-click on TEMPLATE.PSD to open it with Photoshop.
Make sure the toolbox and tool options bar are visible. If not, select Window > Tools and Window > Options respectively to display them.
The image might appear too big or too small. To adjust magnification select Zoom Tool from the toolbox. The options bar changes to reflect zooming options. Turn on Resize Windows To Fit checkbox and click Actual Pixels button.
Make sure the Layers Tab is visible. If not, select Windows>Layers to display it.
Select Move Tool and right-click the word "company" in the upper left corner. In the drop-down menu of layer names choose COMPANY. This layer will get selected in the Layers Tab. You may think of layers as of transparent films with images and text placed on them. You can edit the contents of films independently, change the order in which they are stacked, and lots of other things.
To make sure you selected correct layer try making it invisible for a while by clicking an eye icon from the left of the layer name in the Layers Tab. The text should disappear.
Double-click "capital T" in the Layers Tab. This switches you to Type Tool and highlights the text. Go ahead and replace "company" with "AcmeSoftware" or your company name if you are not just doing tutorial.
Highlight the text you just typed in order to edit font, size, style, and color. Use drop-down boxes in the options bar to change font to Arial, size to 24pt, and style to Bold Italic. Then press green rectangle in the options bar to display color dialog. Your mouse pointer turns into a snippet. There are many ways in Photoshop to specify color but for now just pick white color from the upper left corner of colors field and click OK.
Drag the layer with edited text a little more to the left with a Move Tool . You will notice that other layers move as well. This is because the layers are linked. You can tell which layers are linked to the currently selected one by a link icon from the left of layer names. Turn off linking by clicking the icons and move "AcmeSoftware" text independently. You may want to restore linking in order to handle company name and logo as a whole some time later.
Congratulations! You made it through this very long step! Next steps will be much easier. Proceed to Step 3: Editing colors.