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Help Can't update or install "most" apps

There are several threads on this issue. Example:

http://androidforums.com/evo-4g-all-things-root/201311-unsuccessful-instal-apps-downloaded.html

Basically, most people fix this by either clearing the cache for the market in manage applications, or by unmounting the sdcard, installing something, then remounting the sdcard.

If that doesn't work for you, here's a couple more threads that explain a different method:

intalling app unsuccessful - unknown error -18 - Android Market Help
Fix for Market apps not downloading or installing (image warning) - Android Forums
 
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