Is there anyway to let messagebox not to close when hit Enter on keyboard?

Question

Dear all,

I got a situation with one of our software using scanner. On every scan, it will send an Enter keyboard hit event. But in our program, if the barcode scanned not valid, it will pop up a messagebox to say it is invalid.
What happened in reality is, if user did not see that messagebox, they just keep scanning. When the next scan comes, the Enter event from the scanner closed that messagebox automatically. So a lot of times, user did not even notice that messagebox at all.
So, I am wondering if there is a way to let the messagebox not to close on Enter keyboard event. We want user has to click the ok button with mouse. Is that possible to change this default behavior on messagebox ok button? Or better just to create my own window to act like a messagebox?

Thanks.