I cannot update anything on my imac

Everytime I push "Software Update" in the top left hand corner, I get the mesage: "Software Update cant check for updates because of a network problem. Software cannot connect to the update server." I run through the diagnostics and it comes out saying: "Your Internet connection appears to be working correctly" I cannot update like that and I cannot update through programs such as iTunes. If I open iTunes and click the "Check for Updates" I get the same message. The only way I have kept up with updates is downloading them straight from Apple's site. I downloaded Lion today, thinking this might take care of the issue but it hasnt. What should I do? I have tried this on 4 different internets...

Could be a corrupted preference (.plist file) ...
Go to ~/Library/Preferences.
Move the com.apple.SoftwareUpdate.plist file to the Trash.
~ (Tilde) character represents the Home folder.
For LIon:   To find the Home folder in OS X Lion, open the Finder, hold the Option key, and choose Go > Library

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