When you right-click on the PXE Manager Service, it fails stating "Could not start the Altiris PXE Server service on Local Computer. Error 1053: The service did not respond to the start or control request in a timely fashion."
Look at the logon Service account in Windows Services for PXE Manager. It will show the account being used. Add this account to the Security NTFS permissions for eXpress Share.
When it reboots within the Windows Services, right-click on the PXE Manager service and restart. It will restart with no issue within a second or two.
Deployment Solution 6.8, 6.9