"You need to restart your computer" error message

hi, in last couple weeks have gotten error message @ least 3 times: "you need restart computer. hold down power button until turns off, press power button again."

recently, received following crash log (below, pasted in enough information). can please tell me means? thank you!
rena

process: microsoft word [464]
path: /applications/microsoft office 2008/microsoft word.app/contents/macos/microsoft word
identifier: com.microsoft.word
version: 12.1.5 (12.1.5)
build info: unknown-81119~0
code type: x86 (native)
parent process: launchd [124]

date/time: 2012-02-13 19:35:48.389 -0800
os version: mac os x 10.6.8 (10k549)
report version: 6

exception type: exc_bad_access (sigsegv)
exception codes: kern_invalid_address @ 0x000000002313f525
crashed thread: 0 dispatch queue: com.apple.main-thread

thread 0 crashed: dispatch queue: com.apple.main-thread
0 com.apple.corefoundation 0x9a44cce5 cfequal + 53
1 com.apple.corefoundation 0x9a4643a1 __cfbasichashstandardcallback + 353
2 com.apple.corefoundation 0x9a4512b9 ___cfbasichashfindbucket1 + 537
3 com.apple.corefoundation 0x9a45942c cfbasichashfindbucket + 252
4 com.apple.corefoundation 0x9a4592f3 cfdictionarygetvalue + 131
5 com.apple.corefoundation 0x9a4849ab __cfxpreferencesgetsearchlistforbundleid + 43
6 com.apple.corefoundation 0x9a4b07c5 cfpreferencesappsynchronize + 53
7 ...ft.entourage.core.framework 0x1d6c3519 csyncservicesmodel::~csyncservicesmodel() + 19
8 ...ft.entourage.core.framework 0x1d6c28ca csyncservicescontroller::~csyncservicescontroller() + 236
9 ...ft.entourage.core.framework 0x1d68c53c cdbusersmgr::~cdbusersmgr() + 170
10 ...ft.entourage.core.framework 0x1d68b6b9 cdbclientusersmgr::~cdbclientusersmgr() + 55
11 ...ft.entourage.core.framework 0x1d69d7a1 db_domemorycleanup + 33
12 ...ft.entourage.core.framework 0x1d69d83d db_fragmentterminate + 97
13 ....entourage.legacy.framework 0x1dba2dc1 hralpacaterminate + 17
14 com.microsoft.office_library 0x020fc3dd msofcontactsethasfrufromword + 143
15 com.microsoft.office_library 0x020ab33c msouninitoffice + 862
16 com.microsoft.word 0x006e4be5 wdcommanddispatch + 3964521

 

about "you need restart computer" (kernel panic) messages
resolving kernel panics
mac os x: how log kernel panic

​

have backtrace section, see, process causing panic.

 

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