It can be most annoying, to say the least, to get an av defs exe problem, but you're not the only one getting such problem and you can put an end to this sort of pc trouble without difficulty. Check out the brief report that follows; I'd like to introduce you to something that you can do yourself to get rid of this difficulty and other difficulties you might encounter.
I believe that by now you already understand that pcs aren't glitch-free and neither is windows; problems occur during the lifetime of your pc and commonly a 'contaminated' registry is shown to be at the root of the trouble. I don't want to confuse you any further, but a simple explanation is that the registry is the spot where windows keeps track of all your constant loading, unloading, and updating of various programs/hardware.
The improper addition or removal of software or hardware can easily cause your registry to get corrupted, thus leading to the point where an av defs exe problem and other errors can start to appear. I'm pleased to report that this can be remedied; and what's more, you can do it right now, even if your technical skills are minimal. Here is a little secret - before taking the high-cost route of calling in professional help for a hands-off fix to this or other errors, the real truth of the matter is that there exist some simple to use tools called registry repair tools that assist you to do a complete search of the registry to find out what the errors are, and then take care of it!
So, whenever you experience an av defs exe problem, search your computer with a tool such as this; the bulk of them give you free downloads, scans, and even fixes. These things work - many technicians use these tools in their day to day computer repair work; it's the speedy and uncomplicated answer. I recommend you to download and install such tool right away, not only will it rid your computer of this trouble, this tool will also repair other troubles that you might not even know about as well as maximize your system's speed and functioning.