Since I installed OSX Lion on my MacBook Pro, sometimes after login, the colored wheel keeps turning and I can't do anything

Since I installed OSX Lion on my MacBook Pro, sometimes after login, the colored wheel keeps turning and I can't do anything. When I click on some icon or in the menu, no happens.
After a long time (more than 1 hour), I decide to switch off my Mac holding the button down and when I boot and log in again, it works normally.
Remark: When I logoff, I do not ask to keep my open programs for the next session.
I have a MacBook Pro 2010 with 4GB Ram.

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