It looks like Palmstore is Itel's preloaded app store. Do you ever use it at all, or do you use a different app store?
If you never use it, did you go to Settings>Apps, select Palmstore, and see if there's a Disable button there? Or is that what you mean when you said you "deactivated" it? ("Deactivation" is not the typical term used in this situation, which is why I'm trying to clarify.)