Why does the KLAgent alway's create a log file in the Windows\Temp folder after a reboot...?
for eg. kleaner (pid 1608) 2009-06-22 23-19-17.log

It is log from Kleaner utility, which is used for remote deinstallation.

Is the kleaner running after every reboot of the server (restart klagent services) ?

Problem caused by NetworkAgent .1710 cleanapi.dll. Try replacing with attached one.

Furthermore after applying new dll it is possible to enable or disable logging:
HKEY_LOCAL_MACHINE\SOFTWARE\KasperskyLab\Kleaner
''TraceEnable'' 0 = off 1 = on

__
kurgan2 provided a vbs script with copies the required dll from network share. script should be used with gpo/loginscript/...

<snip>
Const OverwriteExisting = TRUE
Set objFSO = CreateObject("Scripting.FileSystemObject")

rem local path and filename to copy to
Set objLocalFile = objFSO.GetFile("c:\path\filename")
dtmLocalDate = objLocalFile.DateLastModified

rem remote path and filename to copy from
Set objServerFile = objFSO.GetFile("\\servername\path\filename")
dtmServerDate = objServerFile.DateLastModified

rem check if file is newer
If dtmLocalDate < dtmServerDate Then
objFSO.CopyFile objServerFile.Path, objLocalFile.Path, OverwriteExisting
End If
</snip>

tnx, will try the new version...

Update 29/06/2009:

Indeed, the new cleanapi.dll will do the trick...
b.t.w. there is a .exe at HQ with the option to use the Admin Kit for deployment.