Disk Utility can't verify or repair hard drive

I started up my Tibook using the install disk and ran disk utility to try and repair my hard drive and it went through the verification process and then said that there was an error and it could not repair the disk. It says that it needs repaired, any suggestions?
Also, when I come back to my computer after being gone several hours, I'm having trouble getting the computer to respond. It's not supposed to go to sleep or go to screen saver, but when I come back, the programs take a long time to respond - any ideas on how to fix this?
thanks in advance.

This is what Disk Utility says when I try to verify:
Verifying volume “Hard Drive”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Overlapped extent allocation (file 479297)
Overlapped extent allocation (file Overlapped extent allocation (file plications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/pgs/eco85.html)
Overlapped extent allocation (file 640270 /Applications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/pgs/eco9.html)
Overlapped extent allocation (file 640272 /Applications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/pgs2/dev.html)
Overlapped extent allocation (file 640273 /Applications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/pgs2/dw.html)
640273 /Applications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/pgs2/dw.html
ped extent allocation (file %@)",1)
640274 /Applications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/pgs2/kbshortcuts.html
Overlapped extent allocation (file 640275 /Applications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/pgs2/la.html)
Overlapped extent allocation (file 640276 /Applications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/pgs2/sp.html)
Overlapped extent allocation (file Overlapped extent allocation (file Japanese.lproj/Backup Help/pgs2/tips.html)
Overlapped extent allocation (file 640278 /Applications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/pgs2/toc01.html)
Overlapped extent allocation (file 640279 /Applications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/pgs2/toc02.html)
Overlapped extent allocation (file 640280 /Applications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/pgs2/toc03.html)
640280 /Applications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/pgs2/toc03.html
640281 /Applications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/pgs2/toc04.html
Overlapped extent allocation (file 640282 /Applications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/pgs2/toc06.html)
Overlapped extent allocation (file 640283 /Applications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/pgs2/tocstart.html)
Overlapped extent allocation (file Overlapped extent allocation (file /wn.html)
Overlapped extent allocation (file 640286 /Applications/Backup.app/Contents/Resources/Japanese.lproj/Backup Help/shrd/nav.js)
Checking multi-linked files.
Checking Catalog hierarchy.
Checking Extended Attributes file.
Checking volume bitmap.
Volume Bit Map needs minor repair
Checking volume information.
Invalid volume free block count
(It should be 2799915 instead of 2799941)
Volume Header needs minor repair
The volume Hard Drive needs to be repaired.
Error: The underlying task reported failure on exit
1 HFS volume checked
Volume needs repair

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