This Article describes a manual installation. Feel free to add a link to an *.opsi-packet. You can find the Rescue-CD at http://www.avg.com/de-de/avg-rescue-cd-download

Create a folder named “avg” in /tftpboot/linux/
and copy some files from the CD from folder /isolinux to the folder /tftpboot/linux/avg

Maybe, one or two of these files are not needed, but the following functioned well, so I saw no reasons to check it out.

Tree of /tftpboot/linux/avg:

boot.cat\\
f1.msg\\
initrd.lzm\\
isolinux.bin\\
memtest\\
menu.c32\\
syslinux.cfg\\
vmlinuz\\

Add to /tftpboot/linux/pxelinux.cfg the following

label avg-rettungsdisk
  menu label Starte ^avg-Rettungssystem
  text help
                         Starte AVG-Rettungssystem
  endtext
  menu passwd MyPass
  kernel avg/vmlinuz
  append initrd=avg/initrd.lzm

That's all.