Hey there, I am Sofia Carter. There are multiple reasons why you may be getting “HP printer driver unavailable.” Incorrectly installed drivers might cause the printer driver to turn defective or obsolete. Damaged print spooler data - The print spooler program connects with the printing server. Print tasks are managed here. A print spooler is software that chooses the order of files to print on an HP printer. The error ‘HP printer driver is unavailable' occurs when the spooler service fails.