that is 2 questions that don't really go together so I'll answer separately the first, superfast computers, if you want a superfast u decide whether u want AMD or Intel then the ram video card power...
The big disadvantage of computers is that they're not human. They can't think for themselves. They can solve problems that are related to math(like graphing or playing checkers) but they can't be...
Check the firewall settings. ping.exe uses a very specific port to accomplish what is made for. In order to see a computer in workgroup the option files and printers sharing has to be on (137, 139...
Computers can make the mind lazy. You get used to not reading a book, or researching something at the library... Just a few key-strokes and you have your answer