So i got back home from the beach from a school field trip this weekend and my nephew was home all day i let him use my computer and he tried downloading a game on my computer illegally but instead he got a bunch of adware and who knows what else this computer might hold now. There's adware in my Google chrome and on the computer, when i start up my computer it opens up a new browser saying i have viruses and i need to call a specific number to get help/service(this is probably a scam). The browser doesn't show on my taskbar nor does it show on the task manager so i can't close nor click 'end task'. I've tried everything, "add/uninstall a program", deleting extensions, deleting the latest downloaded files on my computer, all those yet i haven't found the adware or virus. Also i prefer not to reset my computer and i haven't backed up my computer in ages.