Do these anti-viruses fight eachother?

I have the following anti-viruses running at the same time, but none of them seem to fight eachother and cause hassle on my computer:

AVG LinkScanner (Not AVG itself.)
Windows Defender
Microsoft Security Essentials
Malwarebytes (Though this dosen't run all the time, only when I say so).

I'm surprised that Windows Defender ran a 3 hour scan (rhymes lol) and didn't cause hassle for the other AV's. But do these fight eachother? It's like I have a huge amount of protection when I don't neccesarily need all of it XD

MSE is an anti virus, Malwarebytes is an anti malware, avg link scanner is not an anti virus , windows defender is anti spyware, so, you in effect only have one anti virus , which is fine.