My laptop Sony Vaio has become full of viruses and bugs so I booted my laptop and install window 7. I never used laptop mouse because I知 not comfortable with that mouse so that I知 using Bluetooth mouse Vaio vgp-bms20. But after reinstalling window 7 this Bluetooth mouse is not working properly it always lost connection. So to connect again I have to reboot the laptop. I don稚 know why this problem is occurring. So friend anyone know solution please tell me.