That's what I wound suggest. Begin with whatever old stuff you can get for free (or almost free). 'Junk' is often used relative to Windows' insane hardware demands, not indicating that the hardware is failing. Only if you have identified a bottleneck in practical use it's worth considering to buy something better.
Say, an Intel Pentium D or one of the oldest Core with 2 GB of memory. Should not cost you much.
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