Attempted to read and write protected memory. This is often an indication that other memory is corrupt.

Wasn't MOSS 2007 sp1 supposed to fix this problem ? I have the MOSS 2007 sp1 installed on a 64 bit machine but still, one of the WFE throws this error. The actual server hosting the central admin is fine and does not show any indication of this error message. In case you come across the same error message, the workaround is to restart the spadmin service (WSS Admin Service) . Few of the searches on internet do refer to the Timer service, but for me restarting the admin service fixes the problem temporarily. Use the task scheduler to schedule a restart (NET Stop SPAdmin, NET Start SPAdmin) whenever event 6398 occurs.