Bootcamp Windows 7 update service disabled after Mavericks upgrade.
Microsoft support diagnostic reports damaged or corrupt files. http://support.microsoft.com/kb/2730071
It appears Apples Mavericks upgrade reduces the bootcamp partition to create an OS X 10.9 restore. This may be the culprit.
Meaning until a fix appears, a clean install of bootcamp Windows 7 is required after Mavericks or otherwise no updates (a royal pain in the wazoo if you're a developer with extenisve install setup time needed).
Apple Support can Apple engineering investiage?