When i try to change my screen saver on my Mac 10.7.2 Lion, i hear a clicking noise on my computer and then it gets hung. Please help

When i try to change my screen saver on my Mac 10.7.2, i hear a clicking noise on my computer and then it gets hung. Please help. Off late my computer is taking too long to open documents etc.

If you hear a clicking noise, as in mechanical I'd be thinking along the lines of failing hard drive. Especially as you mention other problems.
Boot from another disk if you have one and do a verify disk or use somethinglike Disk Warrior or Tech Tool.

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