How can someone acquire general credentials to my computer, change my network settings and slowing down my internet connection? He also puts my wireless out of function and he is enabling firewalls without authorization.

How can someone acquire general credentials to my computer, change my network settings and slowing down my internet connection? He also puts my wireless out of function and he is enabling firewalls without authorization. I have been searching for virus but the only i was finding constantly was tracking cookies

Hi, First, please ensure the anti-virus software is up to date, and then make a full scan on your computer to check whether it is infected with any virus or malware. Second, you need set a complex enough password for all the administrators to prevent someone's enumerating the password out. Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”