Who knows. Even mac's get viruses. Sometimes, every couple of years, I upgrade the operating software. You'll get rid of whatever you have like that. Just make sure you save your pic's and documents externally and then reload them once the new operating system is in place. People do virus sweeps and stuff but it's easier and faster to just put a new operating system in. That's all I can think of unless it's your router. You may want to perform a free speed test (just google it) to see if your router is working up to par. Those things get old and messed up and sometimes require and upgrade. Check your router speed first!