I Deleted the mac app store because of error 4 and i cant download it with software update

I Deleted the mac app store because it showed error 4 and I cant download it with software update.

I guess you have no time-machine or carbon copy cloner backup at hand.. then you will go a manual way.
Mac AppStore is included in 10.6.6 first and a updated better version ( the latest ) is in 10.6.7, so I focus on the later :
Use the shareware ( works without paying , nag screen only ) called "pacifist" . Locate the 10.6.7 update package on your harddisk, mount the dmg, go inside and right-click the installer package, it wil offer you top open it with pacifist instead of Apples OS installer.
Inside pacifist you can see the various sub-packages, one item is the Mac App Store, select it and choose "install to default location" from pacifists menu.
This way you bypass the OS' logic that it is already up to date and will find AppStore in your Applications folder.
Note that this scenario is totally unsupported by Apple of course and you do it on your own risk.
The official way if you have messed up the OS and have removed parts of it, would be to wipe and reload OSX plus its updates to be back..

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