Can't download updates

i have macbook pro. have been trying download updates couple years can't. following message comes up:

digital signature package incorrect. package may have been tampered or corrupted since being signed "apple".

know means?

 

a couple of years should have contacted apple sooner. try couple of things before do, doubt help:

1) empty safari cache (file menu in safari> empty cache.

2) re-set safari, file menu>re-set safari

3) perform pram re-set:


http://support.apple.com/kb/ht1379?viewlocale=en_us&locale=en_us


4) reset smc:

http://support.apple.com/kb/ht3964



if these not solve issues contact apple.

 

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