Have re-installed Microsoft Office several times and cannot get Outlook to work.

Have re-installed Microsoft Office several times and cannot get Outlook to work. Crashes occurred when rebuilding database on previous attempts and now the program will not allow me to rebuild or open Outlook before crashing.  I get the message below. 

Process:         Microsoft Outlook [4846] Path:            /Applications/Microsoft Office 2011/Microsoft Outlook.app/Contents/MacOS/Microsoft Outlook Identifier:      com.microsoft.Outlook Version:         14.0.0 (14.0.0) Build Info:      Unknown-100825~0 Code Type:       X86 (Native) Parent Process:  launchd [88]  Date/Time:       2012-10-15 15:57:10.344 -0400 OS Version:      Mac OS X 10.6.8 (10K549) Report Version:  6  Interval Since Last Report:          67248 sec Crashes Since Last Report:           11 Per-App Crashes Since Last Report:   1 Anonymous UUID:                      A82076F2-6F30-4BF6-B39F-C7480A853A05  Exception Type:  EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000002, 0x0000000000000000 Crashed Thread:  0  Dyld Error Message:   Symbol not found: __ZN14PreferenceKeys46kUseEmailToDoRecipientEncryptionCertsLookUpKeyE   Referenced from: /Applications/Microsoft Office 2011/Microsoft Outlook.app/Contents/MacOS/Microsoft Outlook   Expected in: /Applications/Microsoft Office 2011/Microsoft Outlook.app/Contents/MacOS/../../../Office/OutlookCore.framework/Versions/14/OutlookCore  in /Applications/Microsoft Office 2011/Microsoft Outlook.app/Contents/MacOS/Microsoft Outlook