Is it possible to convert Bitcoin Miner to Litecoin Miner?
No, you can't. And this has nothing to do with the operating system. Your hardware has a bitcoin ASIC chip made only for doing Sha-256 calculations. Litecoin uses the Scrypt algorithm. Sha-256 and Scrypt are not the same, so what you are suggesting is impossible.

You can mine other Sha-256 coins instead of Bitcoin.