Hey guys, I'm planning on upgrading my new Lenovo IdeaPad 300 17".The first thing I want to upgrade is the hard drive. I have not booted up the laptop yet. My question is after I upgraded the hard drive, will the factory software and OS on the laptop remain, similar to upgrading RAM. Or will everything erase and I have to download a copy of the software and OS before upgrading. Sorry if I sound confusing, this is the first PC I plan on upgrading. Thanks!