Problem
When configure PXE Service Point in Microsoft System Center Configuration Manager 2007, booting may fail with the following errors:
PXE-T04: Access Violation
PXE-E36: Error Received from TFTP Server
PXE-M-F Exiting PXE Rom
You also may notice missing entries in the SMSPXE.log
Cause
This can occur because of wrong DHCP configuration.
Solution
You may need to configure IP helper (BOOTP) settings on the routers OR configure DHCP scope options in case you have Cisco DHCP instead of Microsoft DHCP.
To Configure DHCP Scope on Cisco Routers, add the following to DHCP Scope:
next-server ‘IP Address of PXE Service Point’
filename bootx86wdsnbp.com
Abduljalil Abolzahab
Abdul Jalil Abou Alzahab 
what if i am using Microsoft dhcp..what configurations need to to be done ??
you can use the ip helper-address command if you have a Cisco router
OR
Configure DHCP Options 66, and 67 but this one is not recommended and it may not work
Option 66 = boot server host name
Option 67 = PXEClient
For more information:
https://support.microsoft.com/en-us/kb/259670