Hi- I have 2 problems which are driving me insane. (1) The PC closes down and restarts at random. This happens whether I am on the net or, for example, working on a Word document. (2) I keep getting the message 'Instruction at '0x0000500 referenced memory at 0x0000500. The memory cannot be read. Click OK to terminate program. Click Cancel to debug program'. Clicking either closes down whatever program I am using. I am on Windows XP Pro and on BT Broadband. I have run the anti virus program AVG. Can anyone help please before I am carted off by people in white coats? Thanking you.