It's still worth your while to run Disk Repair before you try the other steps. At any rate, it can't hurt.

DR sometimes doesn't do the whole job in one shot, so if it runs and still returns an error, rerun it n times until it comes up clean.

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire