License server require msxml.dll in order to function.
In Windows Vista, 7 and Server 2008, that dll is not included. It is included in the rpro folder of a Retail Pro installation. One aspect that we could not yet explained is how the license server managed to run for a few weeks before stopping. In any case, the solution is to copy the msxml.dll from the Retail Pro server to the workstation along with the v8LicenseServer.exe. Then use the command regsvr32 “