Hello, @IanMcL – Hope you are well 🙂
Allow me to welcome to HP Support Forums! It is a great platform to get help from the community, get suggestions and find what has worked for others!
I see that you are looking for Officejet 990c Windows 10 full feature printer driver. I’m afraid that the Windows 10 full feature drivers for this model are not available since this is a very old model.
You can perform a manual cleaning of the print cartridges as suggested here: http://hp.care/2oVP4al
Please let me know if this resolves the issue, or if you require further assistance!
Cheers 🙂
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DVortex
I am not an HP Employee