OK, what the fuck have I done this time??

[ecchi]

Yesterday I noticed that the text in my web browser had got smaller. I first thought that I had accidentally reset the "text size" setting on the browser, I hadn't. This morning I realised that text boxes were also smaller, so I assumed I had changed the screen resolution. Again I hadn't (with the combination of XP and cheap monitor that I have, I am already on the maximum setting).

I have gone through all the settings I can find, but apart from the one for the browser I cannot find any control that allows me to change font size. Does anyone know what I did to fuck up my display, and how to fix it back (I'm using Windows XP)?

Thanks.