Corrupted and damaged game files can create a wide variety of problems and errors.
Troubleshooting steps for latency problems in StarCraft II
Troubleshooting steps for connection problems
How to install a Blizzard game you already own on a different computer
Information on moving Blizzard games to a different hard drive
Troubleshooting for problems installing or patching the Starcraft II game client
Information about the global play feature of Blizzard games.
How to reset in-game options
Use these steps to repair file permission settings for the game folder and all enclosed files/folders.
How to enable maximum download rate