Hi Theo,
It the dialog from your screenshot which shows the different versions of the siFilterIP is not the list of active filter drivers. It is a list of available driver versions on the local windows driver database. All drivers which where installed over time are in this database and could be used as filter driver.
The Properties list of your NIC is usually a good indicator how many filter drivers are installed. And this looks fine for me.
But maybe some other filters are hidden.
Normally CVB uninstalls the used filter driver after uninstallation or during an update to a newer version.
It is correct that Windows 7 is limited to a maximum of 14 filter drivers.
But by default the limit is set to 8
And this can be changed with following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Network\MaxNumFilters
Change it to 14 and try again if it works then.