How to reinstall Mac App Store on Mountain Lion?

Hi,
after update to Mac OSX Mountain Lion I was not able to run App Store (it was still showing message "connection failed")...So I thought it was clever to uninstall it (with AppDelete) and then download it somehow and install it again. It wasn't.
I had even other small issues. Then I found out I can download the last update directly from Apple.com (OSXUpdCombo10.8.2) and it of course didn`t install App Store on my Mac. I also tried some geek stuff with Pacifist app and older combo updates..still not working.
I'm not IT talent...so PLEASE HELP ME.
Frank

Reinstall OS X Mountain Lion. Press Command and R keys on boot and reinstall OS X Mountain Lion

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