Why is my Antivirus not working?

The absolute biggest problem with anti-virus software is that AV software is ALWAYS one step behind the virus authors. 

If AV software wrote more viruses themselves, then maybe, just MAYBE they might learn about new threats before they are unleashed, but that's like gun ownership; do you buy a gun from a gun store or get shot before you could go out and buy one? I use AV software, but I'm all too aware it has that flaw, regardless of which one I use of the many out there.

No, that stuff is for people who don't understand computer technology.

Learning safe practices on your computer will protect you better than any software.

anti-virus software don't detect new malware strains until there is a work around to detect such. 

First, if you are running Windows 10 you do not need another anti-virus program.  the Windows Defender build into Windows 10 will protect your PC just fine.

No antivirus is perfect. It is impossible to write a program that will protect you from all the viruses or worms that will be written in the future.  The worm has to be created, released, and discovered before the anti-virus can be updated to block it.

Reinstalling the same antivirus will not make it work better.  It is still going to be the same program using the same definitions to find the viruses.  Making sure that it is up to date on the definitions/updates is what you need to do instead.

How did you find the Worm?  If your antivirus told you it was there, then it worked.  It found the virus.  

You need to regularly update it.

Antivirus software only works after a threat has been released in the wild.

How did you find out you had a virus if your antivirus doesn't work? 

Why buy when there are plenty of free ones. Windows Defender seems to do the job ok.