Computer is a Dell Desktop with 6th gen i5, 16gb ram, 500gb 7200 SataIII, & gt 730 video card. Used just for surfing the web, email, and youtube videos and runs like a dream for the most part. The computer belongs to a friend who said it was getting pop ups he could not exit out of and warnings of malware. He said he reset windows using Windows 10 'reset this pc' option and that seemed to fix the problem very briefly then it started happening again, computer bogged down, pop ups you cant click out of, malware warnings urging to download software to remove it.
Sounds like a classic malware issue. He brings it to my house, without connecting it to my network, from a usb I install and run malwarebytes and run it, doesn't find anything. I install avast and run a boot time scan(allows Avast to detect and remove hard to detect viruses before the operating system starts up) nothing detected again. I do a factory reset using the recovery dell put in place wiping everything and basically as stated bringing it to the state it was in when it left the factor/bought it.
Works fine for me, give it back to my friend, couple hours later he emails me saying its happening again. He brings it back over the next day after shutting it off from that point, I cannot replicate the problem at my house however, regardless I make sure he has up to date antivirus, no viruses again, his windows 10 is completely updated and run it for a couple hours surfing the web and playing youtube and nothing happens out of the ordinary. I even downloaded chrome(he was using edge) and installed avast web security, a good pop up blocker, and https everywhere and sent him on his way.
Few hours later get an email, same thing happens but worse
"When I turned the computer on, it went to program compatibility troubleshoot. I went to yahoo mail and facebook. Then I tried to go on gmail. I typed my screen name but every time I tried to put my password in I would get a crazy popup. I had gotten another crazy looking popup prior to that. About the 10th time of trying to put my password in, I got a malware notice. It would not let me X out so I shut it off."
Scratching my head here but I think maybe his home network could be compromised? His desktop runs off wifi by the way and it also has bluetooth active so maybe neighbors are screwing with him? Not sure what to think, everything is clean, runs smooth, and fine at my house. It has been wiped a couple times now, deep scans dun that Ive never not seen detect something if its there, and I have never first hand seen this issue. I am going to go to his place next to check his home networking situation but any thoughts at all?