Can you download and run this app:
http://www.alexnolan.net/software/SysSpec.exe
First press the "System" button in the top left , and then press on the little arrow next to it and select "info to clipboard" , then rightclick/paste the info in youre next post here?
And can you also have a look in youre device manager to see if there are any exclemation points and/or question marks there?