Installation drivers problem

Hello, I have a problem with the drivers installation. I have downloaded the 64 bit drivers from the community downloads (tried with 32bit too:same results), extract the folder into desktop, but if I select install doesn't work, I obtain the following message:
"The requested operation failed, A system reboot is required to roll back changes made".

What I have to do to resolve this issue ?.

P.S.: the solution provided here doesn't work:

Since I don't think I am the only one having this problem a tutorial about the solution could help a lot. Thank you guys.