Mac App has not been signed by a recognised distributor?

After i download any .dmg and install it by putting it in the 'Applications' folder. I then try to open it from the applications folder and it says -“ANY .DMG FILE I DOWNLOAD” has not been signed by a recognized distributor and may damage your computer. You should move it to the Trash. It will not let me open the applications. I feel that it is a Lion problem because it says it with any .dmg file i download. What can i do to fix this?

Don't put the .dmg file in the Applications folder.
Place it somewhere else, like on the Desktop. Then open it by double-clicking it, and run the istaller (if it has one) or follow the installation instructions (usually presented in a text document).
Opening a .dmg file often, and running an installer almost always, will require admin approval via entering the admin password in a splash screen. This is a safety/security feature, to prevent nefarious software from being able to auto-install.
There are some settings in System Prefrerences > Security & Privacy > General which can be used to make some adjustments to the level of security employed.

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