That window is the virus. I had similar issues with my home system when I was away for business. The wife got the computer infected with a warning link regarding antivirus software. All these popups are bogus.
On my laptop I was having the same issues, I pulled the McAfee and put on Norton, plus both companies have stand alone fixit files for this type of infection.
I was not very impressed with McAfee's inability to stop this. It was kind of like the guards standing outside of the castle in "Monty Python and the Holy Grail" when Lancelot is running across the field.
These are dangerous files. One of them eventually crashed the home desktop. I was lucky to retrieve the data off that one.
If you have a backup system be ready. If you don't you may want to start copying all your important files in prep for heavy seas.
As far as interesting software for emergencies goes I purchased Spotmau's Power Disc and it allowed me to retrieve a bunch of data I had failed to backup. It cost me $50, but I got a whole summer's worth of kids pictures off with it.
MacAfee is the TSA of antivirus software. It slows down all the programs on a computer looking for the bad guy, and still lets the bad guy through.
carbonite is a great tool for PC backups. I’ve restored a couple of times due to disk failure and works like a charm for all your data files. At least those you have marked for backup.
exncrypted and works anytime you are connected to the internet. You dont have to remember to do backups. $55/yr or something like that.