A family of Microsoft word processing software products for creating web, email, and print documents.
An Office repair may improve the situation, as aly_ali suggested. Have a look at https://support.microsoft.com/en-us/office/repair-an-office-application-7821d4b6-7c1d-4205-aa0e-a6b40c5bb88b.
I suspect that you need to contact Dell, though.
For more on activation issues, see https://support.microsoft.com/en-us/office/unlicensed-product-and-activation-errors-in-office-0d23d3c0-c19c-4b2f-9845-5344fedc4380.