alejandrafromwestcliffe wrote:
I was scanning my MacBook with MacKeeper antivirus.
Why? Were you having a problem that made you think you were infected or because a MacKeeper ad told you to? If the former, start a new topic to deal with the problem as it's almost never caused by malware.
It found an infected file which cannot be either moved to quarantine or deleted.
We would need the name of the infection and the file's location to help you with this. Normally that information will be displayed or in a scan log.
The people from MacKeeper did a remote support
That is rarely a good idea. You don't know anything about these people and what they might be doing while rummaging around in your computer. If you get to a point where you need hands-on technical support, go to an Apple qualified repair facility.
unfortunately they said it's a hidden file and in order to unhide it, the Terminal Tool is needed but couldn't find it in my mac. For some reason it was removed
Another sign of incompetence! Take a look in /Applications/Utilities/ for the Terminal app.
Lastly, I note that your profile doesn't mention that you even own a Mac or what version of OS X you are using with it, so you should update that and we won't need to ask next time.