My Windows 10 x64 Pro installed the microsoft CPU dirver for this CPU. Is that appropriate?

Yes it is, But if you get the Intel update would be preferable.

Does this work for a laptop?

This is for desktops only. Laptops are not upgradable as their CPUs and GPUs are soldered to the main boards directly.

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Intel Core i9-10900X - Core i9 10th Gen Cascade Lake 10-Core 3.7 GHz LGA 2066 165W None Integrated Graphics Desktop Processor - BX8069510900X

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