Firefox freezes on start (have tried compatibility, reinstall, and older versions, and disabled anti-virus)

Firefox completely freezes when I open it (don't have to click on anything, or do anything). I read that Hyper-Threading could be the issue on Pentium 4 machines. I'm on a Pentium, so I gave it a shot. When in campatiblity, it loads, but when I try to open a page, it crashes (comes up with the Mozilla crash reporter thing).
When it does freeze up, the CPU usage never goes above normal (rarely goes above 0%), and memory is within sain range (~20MB).
I have completely uninstalled (removed bookmarks, addons, everything) and reinstalled, and it doesn't help. I have also tried Firefox 4, and 3.5 both have the same issue.
This tells me it's something with my boxes setup, but I'm not sure where to look. Any help would be appreciated.

Solved it.
Apparently, the check box "remove all personal/user data" in the uninstall does not actually "remove all personal/user data". That really should be addressed. I had to:
1. Uninstall Firefox
2. Delete %USERDATA%/Roaming/Mozilla/Firefox
3. Reinstall Firefox
Now it works. (I'm posting from Firefox.) Apparently, something was corrupted.

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    AdapterVendorID: 10de
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    OS Version:      10.7.3 (Build 11D50d)
    Architecture:    x86_64
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    Command:         iPhoto
    Path:            /Applications/iPhoto.app/Contents/MacOS/iPhoto
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    Project Name:    iPhotoProject
    Source Version:  4240000
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    PID:             980
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    Steps:           19 (100ms sampling interval)
    Pageins:         0
    Pageouts:        0
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          19 ??? (in iPhoto) [0x124b80]
            19 NSApplicationMain + 1054 (in AppKit) [0x9c5eb261]
              19 -[NSApplication run] + 911 (in AppKit) [0x9c357675]
                19 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 113 (in AppKit) [0x9c35b306]
                  19 _DPSNextEvent + 678 (in AppKit) [0x9c35ba9c]
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                      19 ReceiveNextEventCommon + 381 (in HIToolbox) [0x901294e7]
                        19 RunCurrentEventLoopInMode + 318 (in HIToolbox) [0x9012217f]
                          19 CFRunLoopRunInMode + 120 (in CoreFoundation) [0x99dce328]
                            19 CFRunLoopRunSpecific + 332 (in CoreFoundation) [0x99dce47c]
                              19 __CFRunLoopRun + 1112 (in CoreFoundation) [0x99dcec68]
                                19 __CFRunLoopDoSources0 + 246 (in CoreFoundation) [0x99da4d96]
                                  19 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15 (in CoreFoundation) [0x99da53df]
                                    19 __NSThreadPerformPerform + 503 (in Foundation) [0x9ac96e40]
                                      19 -[NSObject performSelector:withObject:] + 65 (in CoreFoundation) [0x99e2dde1]
                                        19 ??? (in iPhoto) [0x50792e]
                                          19 -[NSNotificationCenter postNotificationName:object:userInfo:] + 92 (in Foundation) [0x9ac45012]
                                            19 _CFXNotificationPost + 2776 (in CoreFoundation) [0x99de3a38]
                                              19 ___CFXNotificationPost_block_invoke_1 + 275 (in CoreFoundation) [0x99e18cb3]
                                                19 __-[NSNotificationCenter addObserver:selector:name:object:]_block_invoke_1 + 49 (in Foundation) [0x9ac59e25]
                                                  19 ??? (in iPhoto) [0x5c2a86]
                                                    19 -[NSLock lock] + 185 (in Foundation) [0x9ac4c826]
                                                      19 __psynch_mutexwait + 10 (in libsystem_kernel.dylib) [0x93b74876]
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        19 hndl_unix_scall + 281 (in mach_kernel) [0xffffff80002d7f39]
          19 unix_syscall + 472 (in mach_kernel) [0xffffff80005ca448]
            19 psynch_mutexwait + 1403 (in mach_kernel) [0xffffff80005a043b]
              19 ksyn_block_thread_locked + 67 (in mach_kernel) [0xffffff800059a7d3]
                19 thread_block_reason + 299 (in mach_kernel) [0xffffff800022f39b]
                  19 thread_continue + 1661 (in mach_kernel) [0xffffff800022f11d]
                    19 machine_switch_context + 361 (in mach_kernel) [0xffffff80002c0939]

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