Hey guys so I am having a bit of trouble with my computer because I think it might be infected. It started when I downloaded some mods for a game that i play just to mess around and I think its likely something could have gotten into my computer through those downloaded mods. One issue im having is when i am browsing the web in Chrome, often 2 windows will pop up randomley and they will be those pesky "update flashplayer now" or a stupid "survey" and sometimes I cant even get out of them without going into task manager and closing out chrome. Another issue I recently started having was my computer would randomly freeze for a second or two then a loud buzzing noise would come on as if the sound that was just playing was be repeated so fast that it made that buzzing noise. It would buzz for 6 or 7 seconds then my computer would restart. Is it possible that this is a virus causing this? I have a custom pc with windows 8.1 64 bit. I have also tried looking for suspicious programs and files in my computer but cant seem to find any....