turn off File and Printer Sharing.
I have an interesting question. Basically, I take care of all the computers in my house, and the network. I have 4 PCs, all wireless. One user (on his own PC)likes to go on bad sites,etc, and is frequently getting infected- even with up to date security software installed. So, my goal is to isolate his computer from other computers on the network- so that malware can't be spread to the local subnet. My router supports Guest Networks- so I created one- and put him on the guest network. Unfortunately, his internet connection seems to time out often for some reason. I have checked the DHCP server lease and it is on an extended period of time before expiration- so that's not the issue. If you can help me out, or offer alternatives- I would appreciate it.