I have the AMD 64 processor in my computer. I also have Adobe's version 10 Shockwave plug-in. The processor doesn't seem to get along with the plug-in, and, especially after logging onto Facebook, Windows would not shut down. The plug-ins were the reason. Once I disabled them, shut down, and start up again; no problems...until the next time I use them. Adobe hasn't resolved this issue with the AMD processor yet, but at least I can get my Windows to shut down by disabling the Shockwave plug-in through Mozilla Firefox.