I am unable to install any updates to my MacBook?

Every time I try to update the software (when the Software Update" panel opens up), I can download the software but after downloading it says "Unable to install software" "An unexpected error occcured".....
I have plenty of HD space (100G available out of 320G), and I've tried repairing permissions, restarting etc but I still get the same error message.
Any ideas?
Thanks,

Hi...
"Unable to install software" "An unexpected error occcured".....
If you have anti virus software instaled, disable that.
If that's not the issue, run Disk Utility to verify the startup disk. Not the same as repairing permissions.
Launch Disk Utility. Select the startup disk on the left then select the First Aid tab.
Click Verify Disk
If the disk needs repairing, follow the instructions for Using Disk Utility to verify or repair disks

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Feb 21 08:57:58 Jespers-MacBook-Air diskmanagementd[278]: DM ->T-[DMToolBootPreference recoveryPartitionInfoForVolume:what:dict:]: inHostDiskUDS=0x103c08c20=disk0s2=Macintosh HD inWhatStr=RecoveryInfoBaseSystemVersion
Feb 21 08:57:58 Jespers-MacBook-Air diskmanagementd[278]: DM ..T-[DMToolBootPreference recoveryPartitionInfoForVolume:what:dict:]: did get booterRecoveryUDS=0x103c08ae0=disk0s3=Recovery HD
Feb 21 08:57:58 Jespers-MacBook-Air diskmanagementd[278]: DM ..T-[DMToolBootPreference recoveryPartitionInfoForVolume:what:dict:]: did mount nobrowse; MP=/Volumes/Recovery HD OMS=0x7fa05b116de0
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              ProductVersion = "10.7.2";
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Feb 21 08:58:12 Jespers-MacBook-Air Software Update[259]: JS: model = MacBookAir4,2
Feb 21 08:58:12 Jespers-MacBook-Air Software Update[259]: JS: 10.7.2
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Feb 21 08:58:14 Jespers-MacBook-Air Software Update[259]: JS: Connected printer: MANUFACTURER:Samsung;MODEL:Samsung CLX-3180 Series
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Feb 21 08:58:14 Jespers-MacBook-Air Software Update[259]: JS: Connected printer: MANUFACTURER:Samsung;MODEL:Samsung CLX-3180 Series
Feb 21 08:58:14 Jespers-MacBook-Air Software Update[259]: JS: Printing drivers update available for Samsung_Common. (return value 2)
Feb 21 08:58:14 Jespers-MacBook-Air Software Update[270]: Acquired Lock: 503, 259, 0
Feb 21 08:58:14 Jespers-MacBook-Air Software Update[270]: Releasing Lock: 503, 259, 0
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