Disk error - can't repair

Hi,
When I startup my Imac it takes forever to get up and running. I sit and wait for the spotlight icon and the other icons at the right top of the screen to open up. When they are present I can begin working, but it takes approximately 10 minutes.
I tried a few times to run the disk-repair app. but I get a weird message that I can't understand. This is what it says ( please note - this is a translation from Danish, so bear with me )
"Controlling the unit 'harddrive'
Controlling HFS Plus-unit
Controlling Extents Overflow-record
Controlling catalogue record
Invalid siblink link ( this line is highlighted in red )
The harddrive unit needs fixing ( this line is highlighted in red )
Error: The task reported an error at the end ( this line is highlighted in red )
1 HFS-unit checked
Units need fixing ( this line is highlighted in red )
I tried to make a disk-repair of the Tiger-DVD but with the same result.
Any help is appreciated a lot.
Imac G5 1,8, 20" 160gb hd   Mac OS X (10.4.6)  

Try to get your hands on a program called DiskWarrior.
http://www.alsoft.com/alssales.html
If the problem is not totally hardware it should get you back going.
If it is hardware it may help you get going again so to archive important files before replacing faulty equipment.(I had some problems with a ALS iMac that DiskWarrior helped provide time to archive before computer retired.)
I hope you are able to get it fixed.

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