While on the internet I got a pop-up that said my computer was frozen (it wasn't) and I should call microsoft right away because of a virus. The number turned out to be to Delray Technologies who, it turned out after about an hour of them poking around my computer, wanted to sell me $99.00 worth of anti-something software. I did find out it was the network that had been hacked, the modem evidently. I have 7 extra computers using my system. So what do I do. I found some vague mentions of changing setting, but nothing I can use step by step. Windows Defender had been turned off, not by me. Attempts made to get into gmail, so I changed my password. The OS was installed only yesterday, new hard disk. I have Avira, free version. Windows 7. Zoom modem by Zoom Telephonics, Century Link wireless service who could not help because its not their equipment.