BIG Problem!

I just bought this Vaio two days ago. Basically, I am happy, but I did not get any recovery software. E.G. I have no possibility to get my display brightness right. I can hardly read from it. Can I download drivers somewhere? Sony just offers updates and some drivers (e.g. ATI) but not the needed ones. The problem has been discussed here earlier, but the LINK doens't work. Who can help me?

Timotheus