If you want to change the default font on your Windows PC, right click and select save as and save the file as ChangeFont.reg.
Double click the file and it will ask for administrator access, allow it. After you do that your font will be changed to Tahoma.
If you want to be able to change your system font to any font that is available on your computer, right click on the reg file and select open with and then select Notepad.
When Notepad opens, look for where you see Tahoma and change it to any system font that you have installed.