Vista - Windows vista media center error?

I get this error every time I try to update the guide in media center.

mcupdate Error: -1 : mcupdate: Unhandled exception:
System.InvalidOperationException: Error creating session: [80004005].
at MediaCenter.Store.SqlLite.ObjectStore.Open(String fileName)
at MediaCenter.Store.SqlLite.ObjectStoreOpener.Open(String fileName)
at Microsoft.MediaCenter.Store.ObjectStore.Open(String fileName)
at Microsoft.MediaCenter.Store.Update.UpdateSession..ctor(String
storeFilename)
at CreateSession(String objectStoreFilename)
at Updater.Run()
at wWinMain(HINSTANCE__* hInst, HINSTANCE__* hInstPrev, UInt16*
pwzCmdLine, Int32 nCmdShow)
ThreadId=1
DateTime=2007-07-31T15:55:53.8678640Z
Callstack= at System.Environment.GetStackTrace(Exception e, Boolean
needFileInfo)
at System.Environment.get_StackTrace()
at System.Diagnostics.TraceEventCache.get_Callstack()
at System.Diagnostics.TraceListener.WriteFooter(TraceEventCache eventCache)
at System.Diagnostics.TraceListener.TraceEvent(TraceEventCache
eventCache, String source, TraceEventType eventType, Int32 id, String format,
Object[] args)
at System.Diagnostics.TraceSource.TraceEvent(TraceEventType eventType,
Int32 id, String format, Object[] args)
at Microsoft.MediaCenter.Store.ObjectStore.Trace.WriteLineIf(Boolean
condition, TraceLevel level, TraceOptions additionalOptions, String
formattedMessage, Object[] args)
at Microsoft.MediaCenter.Store.ObjectStore.Trace.WriteLine(TraceLevel
level, String message)
at wWinMain(HINSTANCE__* hInst, HINSTANCE__* hInstPrev, UInt16*
pwzCmdLine, Int32 nCmdShow)
at wWinMainCRTStartup()
at wWinMainStub()