PSE11 normally uses the system fonts. Have you added extra fonts? Are all your fonts installed in the correct place?
If your fonts are installed in the system fonts location, PSE automatically picks up all your stsem fonts and shows it in the Fonts list under Type Tool.
Whenever you install a new font in your system, relaunch PSE( if font is installed with PSE open), and the new font is added to the list in PSE