When I click on System Preferences > Accounts, I get a crash [every single time].

Here are a few interesting snippets from the "Problem Report".

Any ideas on how to tackle this?

Process:         System Preferences [607]
Path:            /Applications/System Preferences.app/Contents/MacOS/System Preferences
Identifier:      com.apple.systempreferences
Version:         7.0 (7.0)
Build Info:      SystemPrefsApp-1750100~5
Code Type:       X86-64 (Native)
Parent Process:  launchd [184]

OS Version:      Mac OS X 10.6.5 (10H574)

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000117547860
Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Application Specific Information:
objc_msgSend() selector name: willSelect
objc[607]: garbage collection is ON

Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
0   libobjc.A.dylib                 0x00007fff80fd211c objc_msgSend + 40
1   com.apple.systempreferences     0x0000000100008426 0x100000000 + 33830
2   com.apple.systempreferences     0x0000000100006fb8 0x100000000 + 28600
3   com.apple.Foundation            0x00007fff84ede23c __NSFireDelayedPerform + 404
4   com.apple.CoreFoundation        0x00007fff824acbe8 __CFRunLoopRun + 6488
5   com.apple.CoreFoundation        0x00007fff824aadbf CFRunLoopRunSpecific + 575
6   com.apple.HIToolbox             0x00007fff82ec691a RunCurrentEventLoopInMode + 333
7   com.apple.HIToolbox             0x00007fff82ec671f ReceiveNextEventCommon + 310
8   com.apple.HIToolbox             0x00007fff82ec65d8 BlockUntilNextEventMatchingListInMode + 59
9   com.apple.AppKit                0x00007fff866c0e64 _DPSNextEvent + 718
10  com.apple.AppKit                0x00007fff866c07a9 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 155
11  com.apple.AppKit                0x00007fff8668648b -[NSApplication run] + 395
12  com.apple.AppKit                0x00007fff8667f1a8 NSApplicationMain + 364
13  com.apple.systempreferences     0x0000000100001cf4 0x100000000 + 7412

...

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000001  rbx: 0x0000000200037840  rcx: 0x0000000200058031  rdx: 0x00007fff5fbfe2c0
...

Binary Images:
       0x100000000 -        0x10001eff7  com.apple.systempreferences 7.0 (7.0) <30C04F1A-7711-1359-8A0E-D707B8BF2EB4> /Applications/System Preferences.app/Contents/MacOS/System Preferences
       0x100758000 -        0x10076dfff  com.apple.frameworks.opendirectoryconfigui 10.6.4 (10.6.4) <4711F2E8-DFA5-4C81-BB2A-B1E39D5B1B91> /System/Library/PrivateFrameworks/OpenDirectoryConfigUI.framework/Versions/A/OpenDirectoryConfigUI
...