anti-spy detects a trojan?

Every antispy program (just like antivirus) program can detect and sometimes clean problems that others do not. They all have there pros and cons. Some programs don't waste their time or yours reporting items that while related to some form of malware are really insignificant minor or non-issues. Some programs on the otherhand report lots of things that may not really be a problem and in some cases are even false positives. For example, many spyware programs detect items in the registry that were added by Spybot (and other programs like it) to block various websites. These are added to the ZoneMaps key.

I think Yahoo may be using a version of Pest Patrol. Exactly what is it reporting. What is the filename and where is it located? Or what is the full path to registry key etc. If you bought the program, call them up and asking them why they report it but cannot properly fix it.