confused.

[deceivedbymyGF]

i have a problem. my friend wanted me to log in her icloud account. then when i log into i see desktop.ini and a note. after 1 hour my pc was just doing whatever i reformated but its still there. theres a user using my pc. i see a registry and deleted it. i ask her but she said she didnt do it. so idontknow where i got a powershell and username remotely control my device. and also gather all my info

i appreciate if anyone can help me. im frustrated cause idontknow where i got it in the firstplace