Apps seem to work but web browsers don't. It's a known symptom of expired antivirus or hijacked web browsers.
I have a modem and a router with WIFI. Typically we run three computers, one or two laptops and an I-pad. All connect and work fine. One computer does not. It connects to MS Outlook and Skype, but it can not connect to the Internet. This computer has windows XP. I try connecting with Explorer or Mozilla, but neither work, both give me a message that they ran out of time. It shows an IP address and I've renewed it several times but still no internet connection. Please help.