Getting PXE Error 0xc0000001 when trying to PXE-Boot a computer with Windows Deployment Services(WDS)?!
Open Windows Deployment Services via MMC.
Expand Servers in the left pane
Right click on the WDS server and select Properties.
Go to TFTP tab and uncheck the box for Enable Variable Windows Extension.
Restart the WDS Server(Task) and try PXE-Boot the computer again.
Ps. Someone, somewhere wrote in a forum that changing the Maximum Block Size to 8192 or 16384 could also help, but it didnt work for me.