At every startup, Mac mini desktop freezes for 10 mins before I can start any program, what should I do?

At every startup, Mac mini desktop freezes for 10 mins before I can start any program, what should I do? The mouse cursor can move around, but the icons are not responding at all. Can't click on anything during the "freezing" period, and this "freezing" happened with every startup. Waking up from sleep mode is OK. Also the systems crashed frequently with any flash-player required pages in web browser. What's wrong??

Hey,
Repair Disk permisions...
Applications > Utilities > Disk utility > Select your Mac OS Hard Drive on the left > Click Repair Permissions.
Jason

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