VisualSVN Server installation fails with the following error message:
Custom action InstallWMISchemaExcute failed: Cannot query proxy blanket: No such interface supported (0x80004002).
It seems to be a bug in NVIDIA graphics adapter drivers which should be resolved in the GeForce 306.23 Driver. However you can also easily workaround the bug following the steps:
Reference link: http://www.visualsvn.com/support/topic/00059/