Safari keeps crashing on start-up. should I uninstall?

It opens for a few seconds and tries to load, or even manages to load a page and then crashes. If it helps the error message reads:

Process: Safari [2761]

Path: /Applications/Safari.app/Contents/MacOS/Safari

Identifier: com.apple.Safari

Version: 5.0.5 (5533.21.1)

Build Info: WebBrowser-75332101~2

Code Type: X86 (Native)

Parent Process: launchd [137]

Interval Since Last Report: 62905 sec

Crashes Since Last Report: 13

Per-App Interval Since Last Report: 462 sec

Per-App Crashes Since Last Report: 12

Date/Time: 2011-06-21 20:55:11.287 +0100

OS Version: Mac OS X 10.5.8 (9L31a)

Report Version: 6

Anonymous UUID: B532740B-A665-42AB-983A-E08D35122E5D

Exception Type: EXC_BAD_ACCESS (SIGBUS)

Exception Codes: KERN_PROTECTION_FAILURE at 0x00000000006fcff0

Crashed Thread: Unknown

Error Formulating Crash Report:

*** -[NSCFDictionary setObject:forKey:]: attempt to insert nil value (key: VMUSignaturePath)

0x963ebfeb

0x95b70e3b

0x963ebdcb

0x963ebe0a

0x978f11f8

0x00093b31

0x000a39c1

0x000a3b17

0x000a0bab

0x000038f5

0x0000a992

0x00002ea4

0x000029f1

0x9716c03b

0x0000c254

0x97140155

0x97140012

Backtrace not available

Unknown thread crashed with X86 Thread State (32-bit):

eax: 0xffff07a0 ebx: 0x924cfcc4 ecx: 0x00000038 edx: 0xff89b1c0

edi: 0x00e61e70 esi: 0x00e61874 ebp: 0xb0287dc8 esp: 0xb0287dc0

ss: 0x0000001f efl: 0x00010286 eip: 0xffff0f38 cs: 0x00000017

ds: 0x0000001f es: 0x0000001f fs: 0x0000001f gs: 0x00000037

cr2: 0x006fcff0

Binary images description not available