Did you say you swiched to 32 bit?
If so is Illustrator not native 64bit?
I belive you can install either 32 bit or 64 bit.
My work compputer isn't as robust as my home pc, so at work I've got the 32 bit installed, and at home the 64 bit.
I uninstalled and reinstalled and still have the problem.
I have to resort to Type>Find Font if I want to change the font.
Have you tried to clear the font cashes?
Reset the Illustrator preferences, by immediately aftere booting hold down SHIFT CTRL ALT.