Friend has a PC, has anti virus running but not sure what. She keeps getting a message pop up saying viruses on computer. When she tries to shut down the message pops up and prevents the shut down. Years since I used a PC, but it sounds like it could be malware she's accidently downloaded ? I've suggested installing anti-malware program or possibly resetting her computer to an earlier date, before she had this problem. Are these the best things to try or can anyone suggest simething else ? Thanks.