Why do computer is slow or no Internet access is not on the landing page?

Users questions:LAN units have a slow computer is always online, or sometimes on the do not increase, other computers are normal, I gave the computer a series of anti-virus and defrag, may still not work, do not know a good public User may have other solution? (Cables and other hardware equipment, no problem) Thank you informed!
Experts answer: bestReinstall the system because you do deal with issues that are in place to solve the system, then I might there have been some deep-seated problems the proposed system is better reload
  • This information provided by the users.Thanks!