My computer has a virus. Help please!

[Name is Unavailable]

First things first, I'm posting from my phone.

I was on memebase.com when all of a sudden a notification comes up on the lower right corner of my screen saying my computer may be at risk. I noticed it wasn't from McAfee, so I was immediately suspicious and opened up McAfee to see if anything was going on. I saw nothing was wrong, until everything closed and then something called "Microsoft antivirus 2012" (or something like that) came up and started running a "scan". I know some people had problems with something like this so I immediately shut off my computer. Should I try to start up my computer and get Malwarebytes to kill it or what? Any help is appreciated.

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[Daemon18553]

You're forgeted.

[Isjix]

try malware bytes, it should work

You're forgeted.

you don't know what you're talking about

[uno_da_cat]

No he isn't.
Get malwarebytes, and a program called "Rkill" from bleepingcomputer.com
That is a good start.
Use Rkill first, then do a quickscan with Malwarebytes.
Status report and we will work from there.

[Name is Unavailable]

I know my dad had malwarebytes installed, but I can't find it. Ill leave it until he gets home. Thanks for the help, locking unless I have further issues.