Do like I tell you and your problem will be solved in one minute ;-)
Click on the below link and follow the instructions.
Click on Netbook
--> Aspire One
Select "Windows 7 Starter x32
" on "Operating System
" and go to the "Application
" tab. Download the "Launch Manager
" driver and install it.
You should have the volume and brightness pop up when you adjust it.
Waiting for your feedback.