Help please...

[CelticTiger]

Just got a new computer and got everything restored etc. I use Font Frenzy to install and uninstall fonts and installed some fonts today...been using it for quite awhile and it's worked a charm - until now it seems as after I rebooted every thing is displayed in some fucked up font....squares, lines, dots and dashes etc. Everything displays okay in my browser it seems...everything else is messed up...menus, buttons and icons etc. The last thing I want to do is have to reinstall everything again. Anyone know how to remedy this?