Wordpress sites fail to open when MyBOok drive is connected to network

I removed the drive and installed on different network with full access and remote also with no problems encountered at all so the drive itself is not faulty. On the original network there are two win7 sp1 pcs off a router all wired. Once the mybook is connected after ten minutes the wordpress sites fail to load. And this happens to all variety of browsers IE CHROME SAFARI. Norton 360 and malwarebytes installed a few days ago didnt find anything