1) Are you trying to install on Vista x86 or x64?
2) Have you taken the correct drivers, INF files and snetcfg matching the OS (32 bit driver for x86, 64 bit for x64)? May be the problem in snetcfg tool if you have taken the original version from DDK instead the modified one we use.
3) Commands mentioned should be executed under Administrator account. You have mentioned that you tried, but I would recommend to recheck.
4) And the last, if you run WinpkFilter run-time installation does it install normally?