May I ask another question on the topic ? I tried to remove parted magic from ubcd as it was said here http://www.ultimatebootcd.com/customize.html :
" Replacing Parted Magic with your Linux distro of choice
The Linux distro Parted Magic is now included with UBCD since it is a more reliable way of accessing NTFS filesystems and USB devices compared to DOS. Most of the payload in Parted Magic can be found in c:\ubcd-extracted\pmagic, so if you wish to get rid of Parted Magic and include your own Linux distro instead, you can reclaim most of the space by deleting c:\ubcd-extracted\pmagic, adding your own distro to c:\ubcd-extracted and adding a section in c:\ubcd-extracted\ubcd\custom\custom.cfg to launch it. "
And now it won't boot , error 0003
" Replacing Parted Magic with your Linux distro of choice
The Linux distro Parted Magic is now included with UBCD since it is a more reliable way of accessing NTFS filesystems and USB devices compared to DOS. Most of the payload in Parted Magic can be found in c:\ubcd-extracted\pmagic, so if you wish to get rid of Parted Magic and include your own Linux distro instead, you can reclaim most of the space by deleting c:\ubcd-extracted\pmagic, adding your own distro to c:\ubcd-extracted and adding a section in c:\ubcd-extracted\ubcd\custom\custom.cfg to launch it. "
And now it won't boot , error 0003