Thats my fonts atm

Some of the dialog box is fine, the yes / no etc is messed up and as you can see in utorrent its horrible, wasnt like this yes2day. tried restarting but to no avail.
First i noticed the prob was in firefox, the font had changed to something else so i added a user.css file and manually set the font, but now ive noticed maximising the program doesnt maximise properly and it instead goes down and to teh right a little bit like thats the extent of the screen
Any ideas on where to look for help? or any ideas on how to fix either of these probs.
Btw ive edited the fonts in the display properties section but the ugly bold font doesnt change