About a week ago I accidently clicked on an add and without thinking instinctively just clicked the download button as this pops up with several of my game updates but then windows defend popped up with an alert saying that "Windows 10 is trying to protect your computer" or something along the lines of that. Naturally worried I started up my antivirus soft ware "Webroot" and scanned for malware. Here's where it gets weird. At roughly the 30% mark a small console box would pop up for a split second (The black background with white text, obviously this doesn't normally happen) and then Webroot told me it did find a virus but it wouldn't allow me to remove it, only to scan again, and again, and again, repeatedly finding the same virus. But now when I scan it can't find anything but oddly it does say it removed 45 threats after every scan from now on... Now there's really no real 'proof' as to whether my computer has a virus or not, but I am almost certain that it still has some sort of virus as it's never run as smooth as it used to since. I'm still worried and was wondering whether completely re-installing windows would remove the problem. You know how some people like re-install their operating system once a year, I was wondering if that would work. Please help. Thank you!