Vista - ntdll.dll problem

Hi, I hope I'm posting this in the right section. I have an old version of mavis beacon that I installed on vista and I it worked just fine. But today when I tried to use it, it kept closing. The error is related to the ntdll.dll file. Anyone know why this file would make this keep happen?

Problem signature
Problem Event Name: APPCRASH
Application Name: Mavis.exe
Application Version: 1.0.0.1
Application Timestamp: 3592b413
Fault Module Name: ntdll.dll
Fault Module Version: 6.0.6001.18000
Fault Module Timestamp: 4791a7a6
Exception Code: c0000005
Exception Offset: 00043387
OS Version: 6.0.6001.2.1.0.768.3
Locale ID: 1033
Additional Information 1: 5c74
Additional Information 2: 08ec40963d098b3286c38157ce556bf4
Additional Information 3: 4b7a
Additional Information 4: 3c9848e4c1cc2df25c1240886e3ca19e

Extra information about the problem
Bucket ID: 691662511

Are you trying to run in compatability mode?

Thanks for replying. No, I'm not running it in a compatibility mode.

Try download from --> ntdll.dll and overwrite file.

Hi Niki,

What changes were made to your system between the time that the program worked and when it stopped working? If the difference is the SP1 update, then I suspect that is where the problem lies. This is actually the same situation that occured with XP and SP2 and the solution to the problem is to either download a patch (if one is available) or to install a new updated version of the program that is causing problems.
Dwarf