Cannot install drivers properly

Hi everyone!
I got a problem with my driver installation process. My USB driver which is missing (for SAMSUNG RF511 laptop based on 64 bit Windows 7 OS).
I tried to get it from web site, I download it for my Windows 7 operation system, but the driver still have that yellow "!" mark. I tried everything - restarted the computer, installed again, restarted but it still doesn't work.
In USB driver properties it show that none driver installed despite the fact, that it should be the right one from SAMSUNG official driver page.
Windows cannot help me, restore point don't work, nothing!
Maybe I should reinstall Windows 7, is there a good chance it will work after reinstall OS? Or should I try something better?
This is a though one...
 
There are many different types of USB devices. What USB device are you connecting that gives you the driver install error?
 
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