How can i install peripherals drivers in fedora core 3.Drivers like audio, video,network,usb.....

What kind of drivers?

- if they're from some manufacturer, say ATI, then they'll give the drivers either as a package (.tar or .tar.gz or similar) or as a binary package (.rpm for example); then you'll either "just install the rpm" or compile the drivers from source, or install by some script (documentation comes in the package, or in the website you downloaded it from)

- if they're "Linux's own drivers", meaning kernel modules, you can see what you've got using modprobe -l and then load a module into kernel using modprobe <modulename without path or .ko or .anything>. Already installed modules can be seen via lsmod. If you think you're missing the whole kernel module thing, and it's not in the kernel too, try recompiling the kernel and adding the module if it's present in the configuration phase.

- there often is no "one way" installing a driver (it's just a piece of software after all, a bunch of files), different kinds of drivers need to be installed differently. In most cases you'll have some installer script at your service.

the drivers i'm talking about are manufacturer drivers like audio, video, graphic, network, usb,.....They come on a cd made by a manufacturer like Dell, HP , so i don't know how tu run cd driver in linux.Please help me

Most manufacturers CDs will only have Windows drivers on them and obviously, you can't use them under Linux. If there are Linux drivers on the CDs, then they should have instructions with them (and those will probably be similar to what b0uncer described).