|I get an error message from "lion.exe". What is it? Is it a virus?
This is a tricky question to answer, since it seems that both valid and unsafe computer programs use lion.exe files. There are some threat reports issued about lion.exe files, but there isn't a lot of information available about them, so I'm not sure what they are. This kind of file - one that isn't connected to specific program and easily researched - is usually best avoided, unless you can figure out what it is and where it came from.
Right off the bat, you should think about a couple things that might help you figure out what these files are all about and how they came to be on your computer.
There is a computer game, called Lion, that uses lion.exe files. If you, or another user, have installed this game on your computer, then the files might be related and benign. If this is the case, then you are most likely getting the error message related to an outdated game driver, which can be remedied by updating the drivers for your graphics card and other game related devices.
You should also be aware that .exe files are related to executable applications, which means that they are program files and are usually set to run themselves automatically once installed. If you suspect the files are suspicious and unwanted, you should use Windows Add/Remove as soon as you can and try to delete all the related files. Most of the time malware files are resistant to easy removal, so you might have to try some more advanced methods to clean your system. The Filetonic article database contains several how-to articles that should be able to offer you some helpful options for a more thorough cleaning.
There are a lot of sneaky ways that malware programs get on our computers, but it's a good idea to be careful whenever you allow an .exe or executable file to access your system. After you try to manually remove the files, run some full system virus and malware scans. Hopefully, this takes care of the unknown lion.exe files.