Apps not "signed"

Most of my apps (angry birds/lick of the day ect) will not install after updating my iphone 3GS. They also will not install on my iphone 3G which uses the older iOS. Both give the same reason "apps not signed" Everything is up to date iTunes/PC ect. Any ideas?

I've never seen that error before but here are a few ideas that came to mind...
Did you buy those apps or did you acquire them through something like Installous after jailbreaking your phone?
Have you signed in with the same Apple ID that you used to download those apps and is iTunes authorized?
Are you using the latest version of iTunes?

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