What is the most useful free Windows utility you always install?

[GhostRider63]

Sometimes one or two sensible changes help more than a full rebuild.

The simplest fix is usually right but it takes longer to find.

I have seen conflicting advice elsewhere and wanted to get a more grounded take on it.

The bit nobody talks about is usually the bit that actually determines whether something works or not.

Happy to share more detail if it helps

[Coder53]

Hmm, not convinced. Cheers for sharing