My last big issue i had was half a year ago with the whole Hola unblocker thing which i dont use anymore. The issue with where i thought my pc was taken over because the screen kept going black was because of the official league of legends screensaver i installed and it messed up somehow and the mouse moving was because i found out my desk isnt 100% level and the slightest nudge makes the mouse move abit.
also with my browsing habbits i rarely stray from a set number of sites, tumblr, 9gag, gaming news websites (eg kotaku), youtube and a number of webcomics i read.
Most of the time i post an issue is because i suffer from terrible anxiety issues and accidently clicking something i thought was an image which sends me to another site that might be bad kind of sets off panic attacks. Even though nothing could be wrong.