Get "invalid app" error when adding apps to iTunes???

For the past 2 years I have been sharing apps with my brother since iTunes on his computer is authorised under my iTunes account. His PC runs Windows XP, mine runs Windows 7. Today I was putting about 10 apps onto his computer and then when I went to add them into iTunes, I kept getting the message "Invalid App" for 8 of them yet it put the other 2 on perfectly fine like normal.  How do I fix this issue? I don't share music or apps with anyone other than my little brother.
We both have same version of itunes too.

TS1814 iTunes for Windows: iTunes cannot contact the iPhone, iPad, or iPod software update server
http://support.apple.com/kb/TS1814
This article has some troubleshooting steps you can try.

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