Antispyware Trouble & Update Glitch

I recently used Paretologic XoftSpy Antispyware to scan my PC for malicious files. It found a Trojan horse named CWS Combo that Ad-Aware, Spybot Search & Destroy, and Norton AntiVirus didn’t detect. Unfortunately, I have to pay for the full version of XoftSpy 4.15 to remove the Trojan. Do you think this is legitimate or just a ploy from XoftSpy’s creators to get me to buy the full version?

The spyware problem has created a huge demand for antispyware, and some vendors looking to cash in on that demand don’t really care if they cause more problems than they solve. Eric L. Hayes maintains a list of rogue antispyware at Spyware Warrior. The applications on his list sometimes use several names, are sometimes marketed using deceptive advertising, and sometimes return false positives to pressure users into buying them. XoftSpy was on Eric’s list of rogue antispyware, but he removed it when its parent company, ParetoLogic, started taking measures to control aggressive marketing and released a new version that reportedly fixed the problems XoftSpy Anti-spyware had with reporting false positives.

CWS, or CoolWebSearch, is a well-known Trojan horse with several variants, and it seems possible that CWS Combo is one such variant. Unfortunately, the only information we could find about this Trojan comes from ParetoLogic, and most of the references we found online concerning CWS Combo are from XoftSpy AS users.