disk write error

when ever i try to copy a file larger than 5mb from cdrom to hdd i get a disk write error.i have checked the hdd but it is working properly may be my bios settings are changed.problem exists even if i load default bios settings.my pc (hp pavilion 8865) configuration are
pIII 1GHz
128mb sd ram
me os
20.4gb hdd
intel 810e motherboard