It just seems that the default core fonts for Windows XP are not present or have been replaced by modified versions with higher line heights.

Normally, the theme used there (the default LimeWire theme) should use the same default fonts found in the Java Runtime.
Reinstalling or upgrading Java may not always change things because Java is supposed to be using core fonts appropriate for the corresponding platform.

So what is the native platform exactly? Which version of Windows XP is used (language of the Windows XP installer)?

I suspect that this may be a Thai version of Windows XP (because Thai characters need a higher line height to align the Thai text with the Latin text at the same point size...) And that Windows core fonts like Arial have been replaced by non-Microsoft fonts.

This problem may also be caused by the graphics card driver, if it's obsolete and was built for elder versions of Windows...

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