Step 1 -  Monitor Task Manager:


Step 2 - Check Startup Programs:


Step 3 - Review Installed Programs:


Step 4 -  Check Network Activity:


Step 5 -  Scan with Antivirus/Malware Tools:


Step 6 -  Review Security Logs:


Step 7 - Inspect Browser Extensions:


Step 8 - Check for Unusual Behavior:


These steps should help you identify and address any suspicious activity on your computer.