Well u asking so apparently can't on your own, which is going to be a problem because all we can do here is give u general directions, the rest is up to you.
So can't find Internet info tells me this is a no-brand laptop. Bummer, and I assume you don't have any original documentation or discs? Bummer+. If a recovery partition exists, one would get there via some hotkey combo during boot but wo ANY documentation, who knows.
Attempt to install new OS via bootable USB?
Old laptop you have to assume battery dead, may wanna attempt boot with battery removed.