I am getting an intermittent error - Generic Host Process Error.
The event log contains:
Faulting application svchost.exe, version 5.2.3790.3959, faulting module msi.dll, version 3.1.4000.4042, fault address 0x00027fb5.
(I then start getting Group Policy Object error messages after that.)
When this occurs, the internet and email exchange still works OK on the local network, but the shared network folders are completely inaccessible from computers on the network. I have to reboot the server to resolve the problem.