WampServer

I often have
Application error Apache.exe, ver. 2.0.55.0, module php_mbstring.dll, ver. 0.0.0.0, address 0x0000b8b8.
What should I do?
Wamp 1.6.3.
I didn`t have this error in a previous versions.

you often have this error? so is apache working when you get this error? is this error in the apache error log?

Very often. I think 1error to 5 requests to localhost.
yes, Apache is still working when I get this error.
in apache error log is:
[notice] Parent: child process exited with status 3221225477 -- Restarting.

Reinstallation of the server over the existing server didn't help.
I have solved this problem by completely deleting the server and installing the server once again.

part of my apache error log is below.
[Tue May 23 12:57:49 2006] [notice] Apache/2.0.55 (Win32) PHP/4.4.2 configured -- resuming normal operations
[Tue May 23 12:57:49 2006] [notice] Server built: Oct 9 2005 19:16:56
[Tue May 23 12:57:49 2006] [notice] Parent: Created child process 2616
[Tue May 23 12:57:49 2006] [notice] Child 2616: Child process is running
[Tue May 23 12:57:49 2006] [notice] Child 2616: Acquired the start mutex.
[Tue May 23 12:57:49 2006] [notice] Child 2616: Starting 250 worker threads.
[Tue May 23 12:58:07 2006] [notice] Parent: child process exited with status 3221225477 -- Restarting.
[Tue May 23 12:58:07 2006] [notice] Apache/2.0.55 (Win32) PHP/4.4.2 configured -- resuming normal operations
[Tue May 23 12:58:07 2006] [notice] Server built: Oct 9 2005 19:16:56
[Tue May 23 12:58:07 2006] [notice] Parent: Created child process 1788
[Tue May 23 12:58:08 2006] [notice] Child 1788: Child process is running
[Tue May 23 12:58:08 2006] [notice] Child 1788: Acquired the start mutex.
[Tue May 23 12:58:08 2006] [notice] Child 1788: Starting 250 worker threads.
[Tue May 23 12:58:08 2006] [error] [client 127.0.0.1] File does not exist: C:/phpdev/www/seo/admin/favicon.ico
[Tue May 23 12:59:44 2006] [notice] Parent: child process exited with status 3221225477 -- Restarting.
[Tue May 23 12:59:45 2006] [notice] Apache/2.0.55 (Win32) PHP/4.4.2 configured -- resuming normal operations
[Tue May 23 12:59:45 2006] [notice] Server built: Oct 9 2005 19:16:56
[Tue May 23 12:59:45 2006] [notice] Parent: Created child process 2440
[Tue May 23 12:59:45 2006] [notice] Child 2440: Child process is running
[Tue May 23 12:59:45 2006] [notice] Child 2440: Acquired the start mutex.
[Tue May 23 12:59:45 2006] [notice] Child 2440: Starting 250 worker threads.
[Tue May 23 13:11:00 2006] [notice] Parent: child process exited with status 3221225477 -- Restarting.

your apache error log looks fine. if apache is working then I would not worry about that error.