Dlaczego zapisujesz domyslnie pliki w C:\Users\Piotruś\ zamiast w C:\Users\Piotruś\Downloads\ ?
Masz zainfekowany system.
Obok frst.exe utworz plik Fixlist.txt z zawartoscia:
CloseProcesses:
HKU\S-1-5-21-1622268550-4094955063-449879671-1002\...\Run: [Opera Browser Assistant] => C:\Users\Piotruś\AppData\Local\Programs\Opera\assistant\browser_assistant.exe [3004440 2020-04-29] (Opera Software) [File not signed]
Task: {03236B8D-68CE-44CD-9D91-D434F3A2890A} - System32\Tasks\Opera scheduled assistant Autoupdate 1588354768 => C:\Users\Piotruś\AppData\Local\Programs\Opera\launcher.exe [1517592 2020-04-29] (Opera Software) [File not signed]
Task: {E9AFCDDF-B16F-4C4A-9A3C-CC5C3EEC98A0} - System32\Tasks\Opera scheduled Autoupdate 1588354766 => C:\Users\Piotruś\AppData\Local\Programs\Opera\launcher.exe [1517592 2020-04-29] (Opera Software) [File not signed]
Task: {99A35CF1-E047-461A-BDE3-3498150B0139} - System32\Tasks\AMDInstallUEP => C:\Program Files\AMD\InstallUEP\AMDInstallUEP.exe [2356736 2019-10-22] () [File not signed]
S2 Previous Versions Library; C:\Windows\Logs\cmd.exe /c powershell.exe -windowstyle Hidden -noninteractive -executionpolicy bypass -file C:\Windows\INF\PNRPSvc\0409\0301\PNRP.ps1
S2 Registration for device management; C:\Windows\Logs\cmd.exe /c powershell.exe -windowstyle Hidden -noninteractive -executionpolicy bypass -file C:\Windows\Logs\Log\231546531\ssfr.ps1
W FRST wybierz Napraw.
Zrob pelny skan przy pomocy mbam i usun wszystko co wykryje ->
https://www.bleepingcomputer.com/download/malwarebytes-anti-malware/
Po wykonaniu sprawdz czy Minecraft dziala.
Jezeli nie to sporbuj zainstalowac
https://www.java.com/pl/download/