Howdy peoples

I've recently bought a new lappy in Thailand as I'm learning to speak, read & write Thai. I use a program called byki to study with. The problem I'm having is that the default Thai font in byki is different than it was back on my old computer with xp and is very hard to read. I cant change the font through byki. Does anyone know how to change the default Thai font in vista.
I also seem to have a bug with firefox 3 as it wont ask nor store passwords for sites/forums even though I have the save passwords option ticked?
Any help would be much appreciated
