When I start my PC and try to open any program, the cursor starts flashing crazily and multiple windows open (sometimes up to 200). When I try to take any action such as System Restore, the machine just shuts down. I'm running Windows XP with SP2 and I have installed Windows Defender, which the problem, whatever it is, won't let me open properly. I also have an E-Acceleration virus scan programme, which I have run 4 times and now tells me my machine is infection-free. The first couple of times I ran it, it told me that I had something called xbarre infecting it, but that had been deleted. However, the problem still remains and I can't use email or internet. I'm having to borrow a laptop to ask for help with this. Anybody got any ideas?