Applications refuse to open Snow Leopard

Hi i have a 2008 + MacBook pro core 2 duo with 8gig ram snow Leopard

I was working with it today and it crashed so I rebooted it, but since them it doesn't work clearly

The finder never opens or when it opens it says unable to open finder error 10810

And no application opens, if I click on an app in the dock, it doesn't even "jump" I can open the application folder but still no app opens

What can I do.

I tried resetting the pram and no good still doesn't work
Thx for the help and sorry about my English

MacBook pro Mac OS X (10.6.7)


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