I always believed the same people who create viruses create the anti virus softwares. Its called need and demand in econimics.
They don't have to. There are enough skidiots out there creating malware. Just look into the common "hacking" forums.
I have Malwarebytes, AdwCleaner, AVG and Avast all free should I upgrade Malwarebytes? I need online protection more than the actual anti virus for threats on my PC
Worse than no protection is having lots of antivirus products. You should always have only one firewall, one antispyware and one antivirus program or the programs are detecting their counterparts as malicious. The antivirus scanners will compete for found detections, they might try to kill each other, which renders having them both less useful than just having one, and they will slow your system remarkably down.
Decide for one and deinstall the others.
Furthermore get some protection for your browser, at least:
* Web Of Trust
* NoScript
Deactivate Java plugins for your browser. You rarely need them and Java-Drive-Bys are really popular.
In case you use your browser to save passwords, set a masterpassword, or they are as good as plaintext for any stealer. If you do the same with your e-mail client, e.g., thunderbird: same here, set a masterpassword.
Or never save passwords with them.
Keep your programs up-to-date to have the most recent security patches, not allowing any malware to exploit them. You can use a Secunia PSI to check for outdated programs.
If you want to try a program that you downloaded and that seems fishy, set up a VM to use it. The VM is like a condom for sex. This is more safe than trusting your antivirus program (morning-after pill), virustotal (asking your partner if she has STI), or some automated sandbox analysis (coitus interruptus). The newest malware is always tailored not to be detected, your system might already be infected when your AV detects something, virustotal might not tell you the truth (heuristics are almost non-existant for the VT setup, these are not the AV settings you would have on your PC), and sandboxie might still let some malware slip through (there are enough anti-emulation tricks that malware employs, so one line of defense is never enough)---as you know one malware to infect you is already too much.
You can have a look at
AV-Test to decide for one AV, or just take AVG or Avira and that's it. More important than the kind of AV is your behaviour. You are the weakest link.