HELP! My Dock has gone!?!?

hi can any one help?
my dock has completely disappeared, its just not there, and when you go to dock preferences its just blank nothing selected but you cannot select anything? also certain short cut keys don't work, F9 and 10 etc for expose and also apple, shift and tab to flick through apps. i'm really stuck and don't know what to do? also you cannot drag anything to the trash as its not there and you cannot minimise any windows, you click the - but nothing happens! has this happened to anyone? can anyone help? anyone got any ideas?
please help thank you

hi
thanks for you help but this error is coming up:
Verifying volume “Macintosh HD”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Illegal name
Illegal name
Checking multi-linked files.
g Catalog hierarchy.",0)
Checking Extended Attributes file.
Checking volume bitmap.
Volume Bit Map needs minor repair
Checking volume information.
Checking volume information.
,"Invalid volume free block count",0)
(It should be 1646347 instead of 1647844)
The volume Macintosh HD needs to be repaired.
Error: The underlying task reported failure on exit
1 HFS volume checked
Volume needs repair
any ideas short of taking it to apple?

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HELP! My Dock has gone!?!?

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