How To Turn Off Visual And Sound Notifications

One USB device on my desktop computer running Win 7 professional does not work. Maintenance service told me that they cannot repair dysfunctional USB because it is build into the case (chassis). But one dysfunctional USB is not a problem at all, because I have 7 other USB slots operating normally. Anyway, now I am getting non-stop notifications of this non-problem!!! Why? The frequency is sometimes very high and always extremely annoying: it varies greatly, it can be between 5-10 per minute. Aural notifications have this annoying sound and visual notifications are popping up in a sizable cloud in bottom right corner of a screen and are lingering there for far too long, and when I click to close it, it pops back immediately. This is a spoiler (I could tolerate one or two dysfunctional notification a day). It is bothering me visually and aurally, greatly diminishing my user experience, disturbing my work, my listening to the music and watching the pictures or movies. After much tinkering I succeeded to turn off sound notification (via Sounds customization), but I cannot turn off visual notifications. I cannot customize Notification area icons - when I try to "Hide icons and notifications" in category Windows explorer where there is this unwanted visual message USB DEVICE NOT RECOGNIZED and click OK, it does not work, because it pops up again immediately - next time I check Notification area icons customization this category is back to "Only show notifications" although I changed it to "Hide".