The TCP/IP Registry Compatibility service may stop responding when a computer that is running Windows Vista or Windows Server 2008 is under high stress
When a computer that is running Windows Vista or Windows Server 2008 is under high stress, the TCP/IP Registry Compatibility (Tcpipreg) service may stop responding. Or, a malfunction may occur in the service. Additionally, some applications that are related to the network do not function as expected.
For example, when you resume a Windows Vista-based computer from hibernation (S4) or from suspend (S3), a malfunction occurs in the Tcpipreg service. In this case, when you try to use the net stop tcpipreg command to stop the Tcpipreg service, the command may stop responding.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB952876.