[Winpcap-bugs] WinPcap doen't find any interface

[GRL]

Today I installed Wireshark version 0.99.6a, which, in its turn, installed 
WinPcap version 4.01. Now Wireshark isn't able to fine any interface (blank 
the related panel), so it's unuseless. Before, using many versions of 
Ethereal/Wireshark and WinPcap I never met this situation.
My system is a Windows Vista Home Premium (and also on this system before 
everything ran fine).
Thanks.
Giovanni