Hey! I just reinstalled Win 7 U. 64 and thought it would be a good time to do a defrag to my C: drive. It was needed.... But after it was done my mouse cursor startet to act a bit strange. Every 5 seconds it blinks with the "working in the background" cursor. And it is EVERY 5 seconds no matter what the pc is doing. Not working at all or working at full load. I have tried to reinstall the mouse driver but it didn't help. It's a Logitech MX 5500 mouse/keybord set. I have also tried to change the cursors and it didn't help either. Hope someone can help me out. I really don't want to reinstall everything again.