I always thought TnT was a false positive, but here are my suggestions.
Try scanning with Malwarebytes' Anti-Malware. This is the one I usually trust.
If the above picks up nothing try SUPERAntiSpyware. Pretty good also.
If you want to be safe you could get Spybot - Search & Destroy. It's somewhat useful. Comes with nice registry protection.
HijackThis seems to be used quite a bit, but if you really don't know what your doing, don't use it.
Getting these programs from cnet would be pretty safe.