Can't install Mavericks on a machine running Mavericks??

okay, can somebody explain to me why an attempt to download Mavericks onto a machine running Mavericks throws an error saying Mavericks can't be  installed this machine?
how am i supposed to reinstall the OS if i can't download it?

It's something PC makers have been doing for years. Apple was pretty much the last company to stop supplying physical media of the OS a computer came with.
For such Macs, the best thing to do is have an external hard drive with an empty Mac formatted partition available. Install the OS the Mac came with through the Recovery steps so you have a clean installation on an erased drive. Then immediately clone that clean install with Disk Utility to the external. That gives you a drive you can reinstall from a heck of a lot faster than over the Internet, and also gives you an emergency drive to boot to in case the internal drive won't boot.
That clone won't have any current or updated data on it, but that's easily fixed, too. You can use Disk Utility to keep a .dmg disk image of your main drive on yet another partition and restore that while booted to the external. You can also use Carbon Copy Cloner or SuperDuper! to do that. There is also of course Apple's built in Time Machine.

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