Hello, Trying to access the Event Viewer in my W7 Ulitimate x64 machine. MMC starts fine, and other MMC apps work. I get same result if I run eventvwr.exe or if I run MMC and then open the event viewer. Each time, I get the following message: Problem signature: Problem Event Name: APPCRASH Application Name: mmc.exe Application Version: 6.1.7600.16385 Application Timestamp: 4a5bc808 Fault Module Name: KERNELBASE.dll Fault Module Version: 6.1.7600.16385 Fault Module Timestamp: 4a5bdfe0 Exception Code: c000041d Exception Offset: 000000000000aa7d OS Version: 6.1.7600.2.0.0.256.1 Locale ID: 1033 Additional Information 1: 46b5 Additional Information 2: 46b58121c9f2560689e145b4dc343836 Additional Information 3: 38d3 Additional Information 4: 38d36bc51ff6dc4d689c937359098f1a I was finally able to run the event viewer by double clicking on the eventvwr.msc file in SysWOW64. In the event log I could open, I found this: Fault bucket , type 0 Event Name: APPCRASH Response: Not available Cab Id: 0 Problem signature: P1: mmc.exe P2: 6.1.7600.16385 P3: 4a5bc808 P4: KERNELBASE.dll P5: 6.1.7600.16385 P6: 4a5bdfe0 P7: c000041d P8: 000000000000aa7d P9: P10: Attached files: These files may be available here: C:\ProgramData\Microsoft\Windows\WER\ReportArchive\AppCrash_mmc.exe_a353fbd4a4cbf6d84ded6216bc4b1182fde53b3d_0fc55b49 Analysis symbol: Rechecking for solution: 0 Report Id: b922e400-a022-11df-872c-005056c00008 Report Status: 0 And this: Faulting application name: mmc.exe, version: 6.1.7600.16385, time stamp: 0x4a5bc808 Faulting module name: KERNELBASE.dll, version: 6.1.7600.16385, time stamp: 0x4a5bdfe0 Exception code: 0xc000041d Fault offset: 0x000000000000aa7d Faulting process id: 0xa60 Faulting application start time: 0x01cb342f77edcea0 Faulting application path: C:\Windows\SysWOW64\mmc.exe Faulting module path: C:\Windows\system32\KERNELBASE.dll Report Id: b922e400-a022-11df-872c-005056c00008 Any ideas?

Hi, Thanks for posting in Microsoft TechNet forums. AppCrash can be caused by program conflicts, system file corrupt or incompatible version of files. Regarding your problem, I noticed that you can run 32bit eventvwr.exe, but can’t run 64bit eventvwr.exe. It seems that the kernelbase.dll file isn’t correctly registered for 64bit. To resolve this kind of issue, I would like to propose the following suggestions: 1. Clean Boot your system to see if the crash occurs. 2. Run SFC /SCANNOW command to automatically fix the system files. 3. Register the KernelBase.dll, please run a command prompt in elevated privilege, and type the following command: Regsvr32 Kernelbase.dll Regsvr32 c:\windows\SysWOW64\Kernelbase.dll 4. If the issue persists, please perform an in-place upgrade. In-place Upgrade is a special upgrade process to repair the system. In-place Upgrade will not affect settings like photos, movies, documents, etc. that are saved on the computer. Moreover, In-place upgrade doesn’t require activation again. 1) Perform a clean boot in the current operating system. 2) Insert the Windows 7 Installation Disc to your DVD-ROM drive. If AutoPlay pops up, click “Run setup.exe” directly. 3) Click “Install now” on the “Install Windows” screen. 4) In the “Get important updates for installation” screen, it is recommended to select the first option to download latest updates for installation, if Internet access is available. 5) Check the box “I accept the license terms” to agree with the installation license and click “Next”. 6) In the “Which type of installation do you want?” screen, click “Upgrade” to perform the In-Place upgrade. 7) Then, follow the wizard to finish the In-place Upgrade process. Best Regards Dale Qiao TechNet Subscriber Support in forum. If you have any feedback on our support, please contact tngfb@microsoft.com Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.