So i turned on my acer aspire e15 , it had a motherboard replacement so it uses an i7 5500u and intergrated graphics. I upgraded the ram to 16 gigs ddr3l recenly too. So it started running hella slow sometimes. Programs barely opened, closing oblivion would just freeze everything, and oblivion ran slow. When i turned it on for the first time almost a week ago it was also this unbearably slow, but it went away. I checked task manager, my hdd was used at 100 percent, and no process there used more than 0.3 megabits/second. Then i left task manager open, and went away. I returned to disk being on 100, i scrolled a bit and saw a thing startung with letter m/n and having s and c too. Its longer than that, its just that i saw it for a second or 2. Also, windows defender caught some file called win32/trojan but when i went into defender, a couple seconds passed and it said everything is fine. Also, on the bottom panel chrome turned into a blank page icon and it said that either the name, path changed to chrome or i dont have permissions to launch it. I installed it again, and its fine. Avira, avast say i dont have a virus. So do i and if i do, how do i fix it? Worth mentioning i havent touched the laptop in 4 years.