Uneven and blurry fonts across the whole system in XP

In Windows XP, all fonts look 'uneven' and are a headache to read. The vertical lines on some characters vary in thickness and blurriness. For example, two characters adjacent to each other have a different thickness of their vertical lines.

These screenshots should help explain:

screenshot 1

then compare the two ds in the word Hidden

I've changed the resolution, the size of the fonts across the whole system, the size of fonts in individual programs, the compatibility of individual programs and nothing has changed. I've "updated" the gpu driver (nVidia GeForce 7600 LE) and have failed to come up with a solution via usual searches.

Personally I use Windows 10 (and I have my own font headaches which are unlikely to ever be solved), but this is my parents' computer which has recently had XP reinstalled, so using a different OS isn't necessarily a preferable option.

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