Unable to remove Printer driver? If you see The specified printer driver is currently in use when deleting a Printer Driver, follow the solutions mentioned here to delete the driver.

If you have installed incompatible drivers -- say, the 64-bit driver version on a 32-bit computer, or Windows XP-only drivers on a Windows Vista system -- device drivers will not work properly.

Your Mac does not have malware, it's just got printer drivers that HP mistakenly asked Apple to block. Here's how to work around the problem.