my power book g4 has gotten very slow is there a way i can fix that

You have us guessing here. Please tell us more about your PowerBook: Processor Speed, RAM installed, screen size, and Mac OS version. We may be able to go farther with more basic info.

Also need to know what size hard drive you have and how much free space you have on the hard drive.

You can get the information Allan outlines above by clicking on the apple on the left of the menu bar then about this mac. Then, if you click more info, you can find the size of your hard drive and how much free space you have. Or you can highlight the hard drive icon on your desktop and push command and the i keys.

Mac OS X: System maintenance

http://discussions.apple.com/thread.jspa?messageID=607640

Mac Tune-up: 34 Software Speedups

http://www.macworld.com/article/49489/2006/02/softwarespeed.html

52 Ways to Speed Up OS X

http://www.imafish.co.uk/articles/post/articles/130/52-ways-to-speed-up os-x/

Tuning Mac OS X Performance

http://www.thexlab.com/faqs/performance.html

11 Ways to Optimize Your Mac's Performance

http://lowendmac.com/eubanks/07/0312.html

The Top 7 Free Utilities To Maintain A Mac.

http://mac360.com/index.php/mac360/comments/the_top_7_free_utilities_to_maintain _a_mac/

 Cheers, Tom 😉