You install Windows Vista Service Pack 1 (SP1) on a computer that is running the release version of Windows Vista. When you uninstall Windows Vista SP1, an exclamation point (!) on a yellow field appears next to a WAN Miniport (SSTP) network adapter or next to a WAN Miniport (NDISWANBH) network adapter in Device Manager. When you view the properties of the device, you receive the following error message:

Error code 39.