How did you try to disable Hardware Acceleration? This is a Flash Player option, set via Flash Player Settings (by right-clicking on a Flash object).
I went to Control Panel> Change screen resolution> advanced settings> troubleshoot. The problem is that my internet browser immediately crashes as soon as I go to a site with any flash items. The only way I'm able to use firefox is by disabling the Shockwave flash plugin; but then flash objects don't show up. So I don't think I can change the hardware acceleration by right clicking on a flash object...