Disk Utility app corrupted

Hi guys!
My disk utility app is corrupted. It show the error:
Dyld Error Message:Library not loaded: /System/Library/PrivateFrameworks/GraphKit.framework/Versions/A/GraphKit

I googled it, but I only got the advise to re-install, or use Pacifist to get just Disk Utility from the disk.

Problem is: my brother left the install disk inside a laptop he then got repaired, so the disk is gone..

Is there any other way I can get this app back?

Thanks a lot in advance!

 

I have Mac OS X 10.6.5 (10H574)

 

Damn, I'm still getting
Process: Disk Utility [1765]
Path: /Applications/Utilities/Disk Utility.app/Contents/MacOS/Disk Utility
Identifier: com.apple.DiskUtility
Version: ??? (???)
Build Info: DiskUtility-2980400~27
Code Type: X86 (Native)
Parent Process: launchd [828]

Date/Time: 2010-12-01 21:06:28.745 +0100
OS Version: Mac OS X 10.6.5 (10H574)
Report Version: 6

Interval Since Last Report: 2034 sec
Crashes Since Last Report: 190
Per-App Crashes Since Last Report: 3
Anonymous UUID: AB7D7BA0-0155-4360-8061-D09D3DB46F33

Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0

Dyld Error Message:
Library not loaded: /System/Library/PrivateFrameworks/GraphKit.framework/Versions/A/GraphKit
Referenced from: /System/Library/PrivateFrameworks/ServerKit.framework/Versions/A/ServerKit
Reason: image not found

Binary Images:
0x8fe00000 - 0x8fe4162b dyld 132.1 (???) <A4F6ADCC-6448-37B4-ED6C-ABB2CD06F448> /usr/lib/dyld

So no success :'(

 

I'm not quite sure I understand. I have another account on my computer that has been there as long as my account, and it doesn't work on there either.
If I installed an app like Onyx, how would I know which files to restore or delete? Would the app tell me? The main reason I need Disk Utility is to reformat a USB-drive that I have encrypted and now want to be open again, and because I want to create another partition on my HDD, to use for Boot Camp.