I changed the windows theme by unpatching. And the laptop usually pops up the message that bitmap fails to load every time I start up windows. Ever since I let the laptop update on shutdown, window's been running really slowly. It takes a long time for the start menu, folders, and programs to open after clicking on it. Even the internet browser loads really slow like when I try to load a web page, the arrow is stuck in loading. It's too slow to the point of being unusable. Sometimes it helps when I press and hold the power button to restart the laptop, but only a little. I tried scanning with Avg antivirus and the computer shuts down and restarts in the middle of it. So I scanned in safe mode. I tried disk cleanup, disk defragment, sfc /scan and disk repair but none helped.