Use the Cleanup Utility to remove the PXE Server
The Acronis PXE Server is absent from Start -> All Programs -> Acronis -> Uninstall Acronis Backup 11.5.
Acronis PXE Server is component of other Acronis products as well. Acronis Backup11.5 does not determine it as component that belongs to it solely.
Use the Cleanup Utility to delete Acronis PXE Server. See Acronis Backup 11.7/11.5 Cleanup Utility.