There are a couple of different articles out there calling TrustDefender a "fake antivirus", "spyware" etc and discussing how to remove it. However, the english in these articles is weak, suggesting that perhaps the articles should also be treated with caution.
Trust Defender Antivirus is not a legitimate and Real Antispyware Program but itself a spyware, more precisely a new kind of rogue antispyware program from the same family of System Armor. The only difference being the core files are altered a tiny bit and the study is changed to hide it?s detection by legitimate Antivirus programs installed on your PC."