why is my internet slow virus? or ISP?

[Penguin]

The software you are talking about, so called "malwarebyte " is a fake and will ask you for upgrading the package so that it can remove the errors and virus.

If my above statement is true then do the following things
1. Remove the malwarebyte completely from your PC.
2. Download a Good rated antivirus (See the download link in source column).
3. Install and Scan the entire PC.

Now about Internet problem
Well, there could be two possible causes
1. ISP- Call them and ask for the speed, one thing I would like to clear that some websites transfers data at very low speed.
2. PC- There could be possibility that the browser you are using is not working well (generally this happens with Google Chrome). In this case I will recommended you for using Firefox