Hello Giedrius,
You’re looking for windows 8 drivers for your system.
Your computer has not been tested to run windows 8.
Here is a link that will let you check the compatibility for windows 8 on your PC.
Most of the driver that are available for windows 7 can be used for windows 8; you just need to run them in compatibility mode.
Here is link to a post that will help you run the drivers in compatibility mode.
Let me know how everything goes.