|Malwarebytes didn't detect the same virus AVG did because the 2 programs scan for different kinds of viruses. |
For example, AVG may detect some kind of virus in your computer. Anti-virus programs use what is called definitions. The definitions tell the program what is a virus, and what is not. The virus detected from AVG was found in the definitions as a virus, so it reported it to you. But that same virus may not be in the definitions of Malwarebytes, so Malwarebytes wouldn't detect it.
It doesn't matter which program detects the virus (as long as it is a reputable program), you should remove it.
CCleaner is basically the advanced version of the Disk Cleaner. I would use CCleaner over the Disk Cleanup, as it detects more temporary files.
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