Hi Mohammed.
If you are getting incorrect colour printing from the machine, it is most likely the fault of the cartridges, not the printer. The print heads for the DP100 are actually built into each cartridge - so changing the cartridge will resolve this issue.
It would also be worth installing the latest printer drivers. if you do not have the disc, let me know and I'll E-mail you a copy of them.
Kind Regards,
David