HELP! My "friend" sabotaged my computer and I can't fix it!

[Purplecinnamon]

Hi so my friend pulled a prank on me by running some script at startup. What it does is it types "colereallysuckscolereallysuckscolereallysucks..." over and over again, in whatever text box you have selected. I don't know where the file is. It starts running about 3 seconds after I log on. This means that searching for it in the windows search bar doesn't do anything, when it is being spammed. Please help me.

 

[FreshRestart]

Do not you have an antivirus? Try to find and terminate the process in the taskmanager.