Hi,

The Dell Latitude C400 net book does not have internal CD drive and does not support boot from USB in boot menu.

Can you please help me, to find out how I can get windows on it.

Looks like it's a bit of a pain, involving pulling the hard drive and using an external enclosure.
How do I reinstall windows in a Latitude C400 without CDROM or Floppy? - Laptop General Hardware Forum - Laptop - Dell Community