I have recently built a new machine running AMD 64 3400+, 1 GB ram. I had a blue window of death problem which i managed to sort out with a scan disc, but whenever i try to browse a folder, hard drives, access the control panel, my computer, disc drives usb drives whatever. Any type of folder my pc will start to lag and freeze up. My CPU usage will go up to 100% and it will all be taken by "explorer.exe". and stay that way till I restart or end task explorer.exe etc. I've tried loads of different pc scans to fix it virus scans, spyware scan. My only solution is to go into task manager and end task. the windows bar then disappears, i then run a new task explorer.exe and everything is fine until the next time. I am loosing my rag with this thing now, can anyone help. I want to avoid reformatting as i have done this 4 times alreay and my pc is only 4 weeks old. If i could get this sorted it would run like a dream.