I have the same problem. If you go into Task Manager (CTRL-ALT-DELETE), click on the error (mine is called QBMaker 32 bit) and then "End Task" it will stay gone a lot longer than if you just hit the X in the corner of the error message itself. It doesn't get rid of it for good, but it at least gives you time to do something in between the pop ups.

It's gotta be a scam. These people somehow get access to our computers and then, Lo and Behold, we have this error and they want a ridiculous amount of money to fix it. Glad I didn't fall for it, but I'm sure some people do.