Active Shield

From Security Stronghold:

Active Shield is works to protect your computer from trojans, spyware, adware, trackware, dialers, keyloggers, and other viruses. The program works to have an active defense rather than a passive defense. What does that mean? Other anti-trojan and anti-spyware utilities search for malicious programs on your hard drive and registry after these programs are already in your system. Active Shield halts them from entering your system just like a firewall halts malicious Internet traffic. If a malicious program tries to reach your PC, Active Shield will intercept it and block it.