When X (the graphical environment) starts, it tries to autodetect your screen dimensions and figure out what dpi setting (dots per inch) to use for fonts. The de facto standard is 96, but someone somewhere thought it'd be nice if fonts were the same physical size on all screens everywhere, instead of being the same pixel size everywhere. Sometimes this dpi lookup doesn't really work out and you get insanely huge/tiny fonts.
What you can do is to tell kdm (the login manager) to start X with an argument telling it to specifically use a dpi of 96, or other sane value of choice. Open up /etc/kde4/kdm/kdmrc in a text editor with superuser permissions, such as by running 'kdesudo kate /etc/kde4/kdm/kdmrc' from a run box (Alt+F2) or a terminal. Find the section that has this line and add the bit in bold green (i.e. -dpi 96):
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ServerArgsLocal=-br -nolisten tcp -dpi 96
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