Alt key make my keyboard stop working

I have notice this in photoshop,most time i hold alt key.it make the keyboard stop working,until i do restart,Now it happening in mac..when i try to view my library by holding the alt key in finder...my keyboard stop working
anyway to fix this?

Go to System Preferences, Keyboard, Modifier Keys, Restore defaults
Then Keyboard Short cuts, Restore defaults
Then if not working
Reset the PRAM
http://support.apple.com/kb/ht1379
Reset the SMC
http://support.apple.com/kb/HT3964

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