I just had a trojan virus on my computer that my daughter's nephew got from a game site called "fog" or something like that. It installed the trojan which caused constant
popups warning me that my computer was infected with multiple viruses and trojans. It was trying to get me to buy "Security Tools" virus software which is just a way to get my money. It apparently also tries to get your passwords.
I was unable to do anything including run my virus software or do anything else that might allow me to remove it. I turned the computer off to give me time to think and look up my options on my laptop. Fortunately this morning my virus software DID find it and quarantined it where I was able to safely delete it. Whew!!
My virus software is Eset Nod32 and I've used it for years. I prefer it to any of the others.