We have 6 PC's upstairs all running Windows 7 and 4 new POS systems downstairs all linked to a NAS. Since we have installed the POS systems the internet on the POS systems is unworkable, slow to the point of stopping. The POS systems have come with Windows XP POS 2009 on them and we are running Myob Hospitality as the POS program. The systems and software is all brand new so no chance of virus's yet. What can I change to make it better? We did have slow internet before the installation with the old POS systems but now it is worse. Thanks.