I have a little problem. Somehow today I mistyped my laptop (Samsung with Windows Vista) and changed the text size on YouTube. The font is now quite small and just so readable. The thumbnail dee videos on the right side of the page / on the start page are displayed smaller.
I already changed the text size in the system settings, which did not work. Only the font e.g. The taskbar is bigger, but it was already normal. So it's only on YouTube.
I ask for help, because that is very unsustainable in the long run.
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Windows Vista is no longer safe because there are no more updates. Therefore I have no solution for your problem.
Own experience with nt and xp… No Service… First occurring problems…
Skype and then all other applications.