I think that's the cause for concern. According to our comments here, bourneyg, five cents and I all had windows update set to notify us first, yet windows update agent 7.6.7600.320 automatically downloaded and installed without any notification. It seems to be a legit update but I think we all want to know why it automatically downloaded and installed, despite our having windows update configured to notify us before doing so. Something like that is suspicious behavior.
legit ? the meaning of that word should be highly questioned after the snowden's leaks
another update to comply with a National Security letter? adding more backdoors for the NSA?
I personally will not take any chance with this shady update, I have windows update permanently filtered in firewall