I would like to share my experience with you. Here are the steps to get Peer Guardian 2 run on windows 7 RC by signing the driver yourself:
1. Download pg2-rc1-test2.exe from here
http://phoenixlabs.org/pg2/2. Install normal, but don't launch
3. Download dseo12.exe from here
http://www.ngohq.com/home.php?page=dseo4. Run as Administrator
5. Now Enable Test Mode
7. Sign a System File by using use DSEO’s sign file option and manually add path for pgfilter.sys
"C:\Program Files\PeerGuardian2\pgfilter.sys" or whereever you installed PeerGuardian
8. Exit and reboot
9. Start->run->type bcdedit /set loadoptions DDISABLE_INTEGRITY_CHECKS
10. Now you can launch PG2 with no problems