Just a word of warning but I had to do a system restore after these updates. First my network connectivity was broken (link OK but TCP/IP totally dead) and later the whole computer/UI froze while investigating.
nForce 590 SLI AMD chipset with built-in network adapters. Both Virtual PC 2007 and MS Netmon 3.1 installed which might have been reasons as they include additional network services. Would've just been rather strange if MS didn't test the updates with their own software.