Microsoft’s successes in producing more secure software are being offset in part by organized cyber criminals, who continue to make inroads into customer PCs largely through faulty third-party software and old-fashioned trickery, the software giant said in a report released today. The analysis comes in Microsoft’s latest “Security Intelligence Report,” which examined the prevalence of malicious software threats removed from Windows machines by the company’s various free and subscription security offerings in the first half of this year. Malware that promotes rogue security and anti-virus programs continues to be the largest single security problem plaguing Microsoft Windows users, the company said. Redmond found that Trojan horse programs – specifically, those that attempt so-called drive-by downloads — were responsible for the biggest share of malicious software Microsoft removed from systems this year (about 30 percent). The overwhelming majority of that malware highlights non-existent threats on the victim’s PC in an effort