Failing at Partitioning my iMac HD

Hi Guys,
This is my first time posting so sorry if it is in the wrong section. I am trying to partition my iMac HD for 100GB for Windows XP. The first problem I encounter is this, in Boot Camp Assistant it says this "The disk cannot be partitioned because some files cannot be moved. Back up the disk and use Disk Utility to format it as a single Mac OS Extended (Journaled) volume. Restore your information to the disk and try using Boot Camp Assistant again. ", then I "Verify Disk" in Disk Utility and it says something has an invalid item count it should be something instead of something. So... I try to boot from the install disk that came with my iMac and it spins for about 15-20 seconds and then spits it out, my iMac reads all other discs. I have tried booting into safe mode and booting up and holding CMD + S and then put fsck -fy, when I do that it says the same as it does in Disk Utility then it says it's repaired but it hasn't. Any help will be MUCH appreciated.
Thankyou

When you insert the Leopard disc and restart with the C key held down, do you still get to Installer's first screen? Are you able to run Disk Utility from the Utilities menu? When you are doing this, does performance seem normal (for running off the optical drive), or does it stall?
In Disk Utility, when you look at the sidebar, does the internal drive have the +Macintosh HD+ volume indented under it, or is it just the internal drive by itself with no volume under it?
You said that if you select the drive in the sidebar, you are not allowed to do +Repair Disk+ on the +First Aid+ tab? If so, and if there is a volume under the drive, try selecting it (instead of the drive) and going to the +First Aid+ tab. Can you them run +Repair Disk+ ?
If there is no volume under the drive, it is possible that you have a serious hard drive failure.
If you have not already, you should try this procedure to reset SMU (power management)
http://support.apple.com/kb/HT1767
Be sure to unplug everything. When you reconnect just the power cord, if you have been using a crowded or old power strip, try connecting it directly to a wall outlet, at least initially for this test. Try powering it up with nothing connected, except the power cord. Is there any improvement?
If not, based on what you described, my guess is that your hard drive has become faulty. If it is also not booting or running normally from the optical drive now, then it may be something else.

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