Can't install the game

I tried to install SC2 but the game wouldn’t open. I’ve tried uninstalling and reinstalling about four times so far. I’ve even tried disabling the firewall and antivirus, as they may be blocking some files, and installing again, but to no avail. It gives the error stating that there are damaged files, but when I try to “check and repair” it says that no problem has been detected.
What can I do? Please help

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