Hi all, I am experiencing a very strange problem and I have no idea how to fix it. After my laptop has been on for about an hour or so (the amount of time varies), everything stops working, in the sense that I lose my wireless internet connection, I cant do anything with the task manager, I cant change the power settings for my laptop (even changing the brightness of the screen doesn't do anything), I cant open windows media player, the device manager crashes if I try to do anything with it, I cant open cmd, event viewer, chkdsk, I cant even change the sound volume, date time, or anything like that. I have to turn my laptop off by holding down the power button, because I cant even shut the laptop down (it hangs on the 'shutting down' blue screen forever). Can anyone help me? My laptop is an Acer Aspire 5738z, running Windows 7 32-bit. I have no idea how to fix this, any suggestions would be much appreciated. Thanks.