I had installed Win 7.
But it has been graphic adapter problem. I could not found Graphic adapter driver.
Your post said you wanted to upgrade, not that you already did.
Next I suppose you will say, I have already been there !
http://eu.computers.toshiba-europe.com/innovation/generic/SUPPORT_PORTAL/
Go to this site, on the computer in question. They have Auto Detect of your system.