I just upgraded my Dell XPS 9000 desktop memory from 8GB to 24GB. I had Windows 7 Home Premium, so I was only using 16GB. I upgraded to Windows 8 Pro, checked the PC info and found I am still only using 16GB of the installed 24GB memory. What is wrong? I understood Win 8 would use all the installed up to one hundred and something GB. Any ideas?

Thanks