- Go to Applications (or Main Menu) > Accessories > Terminal.
- Paste sudo apt-get install ttf-mscorefonts-installer into the Terminal (by pressing Ctrl-Shift-V in the Terminal after copying the highlighted code).
- Go to System > Preferences > Appearance > Fonts.
- Click each of them, pick a font and size to configure for window title and so on.
- Press Alt+F2 to bring up "Run Application" window.
- Paste gksu nautilus /usr/share/fonts/truetype into the box, click "Run" to open Nautilus in the right folder.
- Create a new sub-folder and copy your files ending with .ttf into the sub-folder.
- Enter sudo fc-cache -f -v in the Terminal to rebuild the font information.
If you like the Tahoma font which is not included in the mscorefonts package, you might want to copy the two files tahoma.ttf and tahomabd.ttf from /Windows/Fonts and install them.