Solve : file transfer error?

1.	Solve : file transfer error?
Answer» We have always had a MAIN modem that links 6 computers to the internet, we have just installed an external HARD drive to the modem and all but 1 computer and copy pictures music etc over to the external hard drive. EVERY time we try to copy we get "cannot read the source or disk" error message, YET on ever other compuer we can copy files on to the drive?? any answers? You mean 'router', not modem. What OS is on the one PC that does not like the NAS?

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