Every time i try to sign in to the mac app store i get the message 'an unknown error has occurred"

I can sign into the iTunes store but not into the Mac App Store. I don't have this problem on my other Mac running the same Mac OS X 10.6.8.

Try deleting the cache associated wi the App Store.
Quit the App Store if it's open.
Now open the Finder. From the Finder menu bar click Go > Go to Folder
Type or copy/paste:   ~/Library/Caches/com.apple.appstore
Click Go then move the Cache.db file from the com.apple.Safari folder to the Trash.
Try the App Store.

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