Yes those are the file archives that I was talking about. They are what hold all the default model files, textures, icons, UI elements, etc. for the game so that you don't have to redownload that data as part of every map that uses default wc3 data. In recent versions of wc3 the .mpq file format was deprecated and replaced with the .casc file format, which functions essentially the same but requires different tools to view/extract from. This program can view and extract from CASCs, and there are many other MPQ viewers here in the Tools section.war3.mpq
War3Patch.mpq
War3x.mpq
War3xlocal.mpq
I get that you're a new user here but... come on dude, at least read our posts and try what we suggest if you're going to ask for help. Your game install is corrupted, reinstall.would uninstall and reinstall wc3, then update by going on Battle.net ... The only reason you wouldn't want to wipe and reinstall now is if you are running an older wc3 patch that you need to use for development for compatibility reasons.
They are trash computers that are too old/weak to be useful in more developed countries so are shipped to poorer countries where they still have some value. Since Warcraft III is an old game usually such systems can run it fine. However it might not be able to run more recent versions of Warcraft III, especially seeing how they will soon require 64bit OS and already need at least Windows 7.1000 php is ~$20, not 90. I’m amazed you got a computer for that little but I see the necessity. Check your PMs.