This is serious and is ITW.
Killbit:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{0955AC62-BF2E-4CBA-A2B9-A63F772D46CF}]
“Compatibility Flags”=dword:00000400
More at SANS here, plus CSIS writeup here (if you don’t “taler Dansk”, then use this Google Translate link).
Best solution? Don’t use IE for now.
Alex Eckelberry
Update: Microsoft info here.