[G4] My G4 is slow. I get the spinning pinwheel for a long time before an app will open

[david duffey]

I have a G4 running OSX 10.4.7

My G4 is slow. I get the spinning pinwheel for a long time before an app 
will open.

When I run the disk utility I get this message. What should I do?

Verifying volume “untitled”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Invalid node structure
The volume untitled needs to be repaired.

Error: The underlying task reported failure on exit


1 HFS volume checked
Volume needs repair

-- 
Scurvybro