kernel32.dll error: what the entry point and crash messages mean and how to fix them

Each file below is Microsoft's own kernel32.dll for one Windows release, fetched from Microsoft's own server and checked against Winbindex, the index of the files in Windows images and updates. These files are for comparison: to confirm that a kernel32.dll you have is genuine, or to see which build your release should have. Copying one into Windows or into a program folder does not fix an entry point error, because the missing function is not in your Windows release, and replacing the file in System32 or SysWOW64 can leave Windows unable to start. Repair the real file with the steps above.

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The wording tells you which problem you have. These are the texts Windows shows, as written, with the file and a typical function name filled in.

kernel32.dll describes itself as Windows NT BASE API Client DLL. It is one of the oldest and most central Windows libraries: programs call it to create and read files, allocate memory, start processes and threads, load other DLLs, handle errors and read the system time. Since Windows 7, Microsoft has moved much of that code into KernelBase.dll; kernel32.dll keeps the same function names and forwards many calls to KernelBase.dll, so existing programs keep working. What Windows reports for the genuine file:

On 64-bit Windows, System32 holds the 64-bit file and SysWOW64 the 32-bit one used by 32-bit programs; the folder names are historical. kernel32.dll is listed among the known DLLs (registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\KnownDLLs), which means Windows uses its own copy for every program and never takes one from a program's folder. The genuine file is signed by Microsoft and shows Windows NT BASE API Client DLL under Properties, Details, File description. Sizes depend on the release: in Windows 11 24H2 and 25H2 the 64-bit file is 861,992 bytes and the 32-bit file 707,744 bytes; in Windows 10 22H2 they are 784,792 and 650,272 bytes. Winbindex also lists a much smaller, unsigned kernel32.dll in System32\forwarders on some Windows 10 and 11 builds: it is part of Windows too.

Every Windows release has its own build of kernel32.dll, updated together with Windows almost every month. Winbindex lists 975 distinct Microsoft builds; the table shows the newest one indexed for each release and the update that delivered it.

Public DLL catalogues have collected 38 copies of kernel32.dll uploaded from PCs, from version 4.10.0.2222 to 10.0.19041.292. Many come from older Windows releases such as Windows 7 and 8.1. The table lists each with its checksums, so you can tell which one you have.

None of these replaces the file your Windows ships: the newest build indexed for Windows is 10.0.28000.3086, and each release keeps its own. If the check on this page finds your file in this list, it is most likely an older Microsoft build that was copied somewhere by hand. Remove the copy, and let Windows use its own.

Copies uploaded by users to a public DLL catalogue, read on 14 October 2026. We list their checksums so you can identify a file; we do not offer them for download and we did not verify each one against Microsoft's signature.