Desktop screen frozen/locked

Hi,
My desktop screen is completely innactive, i can't click on or drag any icons and access anything via the main desktop screen. I can access everything from finder though. I have tried going onto get info on the desktop screen in finder any checked to see that it is unlocked and i have made sure that on the ownership and permissions it says 'read and write'. I am really stuck and frustrated. Hope someone can help or knows how to fix the issue.
Thanks,
Angus

Try Repairing Disk Permissions
Go--> Utilities--> Disk Utility--> Select the HD--> Click Repair Permissions

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