My grand daughter was using my computer and later after she left I noticed that the firewall was off. When I try to turn it back on it it won't stay on it continuues to turn right back off. I called my grand daughter and she insists that she didn't download or try to install anything but I'm skepical. Does nayone have any suggestions? I did a complete scan with McAfee and it returned no viruses or trojans.
You may want to try to follow some of the suggestions in this document regarding the McAfee stinger scan and some of the others mentioned in Anti-Spyware, Malware & Hijacker Tools to give you some peace of mind.
May i first suggest you try to run the McAfee Virtual technician found at the top of this page under Useful Links in the Technical support link. MVT will scan your computer for any McAfee related issues and if it finds any it will attempt to fix them for you. If the firewall will not stay on after performing some of the suggestions above, you could contact Technical Support Chat who could remote connect into your computer to see if there are any conflicts. You would need to grant them permission to do so and they have many more tools available than we have here on the forum.
Let us know how things go for you