analyze .dmp file - cannot get past symbols in windbg

I am trying to use WinDbg to analyze a .dmp file.  However, even though I have dowloaded the symbolx, I continue to get the following error:

Unable to load image \SystemRoot\system32\ntoskrnl.exe, Win32 error 0n2
*** WARNING: Unable to verify timestamp for ntoskrnl.exe
*** ERROR: Module load completed but symbols could not be loaded for ntoskrnl.exe

Any ideas?  I need to get into the .dmp file to try to determine the root cause of an unexpected server shutdown

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