The fact that you have had ongoing issues implies a bigger problem than can be solved by deleting DW cache or preferences folders. That's why I asked for your Windows Event Logs. And I see you have a faulting module problem with ntdll.dll -- a windows system driver. Below is the How To for trouble shooting this on your own.
How To Fix Ntdll.dll Errors [Windows 8, 7, Vista & XP]
Nancy O.