How to get Realtek to work again?

I know I've already asked this question and I really did favour the answer of doing a System Restore but once I did that, I realised that the Realtek wasn't part of the Restore and my laptop recommended me to download it instead.

So, that's what I did and, again, I was successful but I did download from a different website (Lenovo) and the installation was great until I got the 'Install Realtek HD Audio Driver Failure! [Error Code: -0001] and I began questioning myself again. I've researched as much as I can but I still can't find anything that seems understandable to me. It's much more helpful if the instructions are as blunt as can be and are just listed like 1,2,3.

I don't know what else I can do. I'm not annoyed (I have a lot of patience, I'm surprised myself) but I just want to be able to do the simple things again like watch a movie, go on YouTube etc.

Again, thanks in advanced!

P.S. My background is Tokyo Ghoul, yes.
How to get Realtek to work again

Only download, from the maker of your Laptop, for the drivers.