If you're one of about 200 million people using older versions of Windows and you want the latest security enhancements to Internet Explorer, get your credit card ready. Microsoft this week reiterated that it would keep the new version of Microsoft's IE Web browser available only as part of the recently released Windows XP operating system, Service Pack

A sample program hit the Internet on Wednesday, showing by example how malicious coders could compromise Windows computers by using a flaw in the handling of a widespread graphics format by Microsoft's software. Security professionals expect the release of the program to herald a new round of attacks by viruses and Trojan horses incorporating the code to circumvent security on Windows computers that have not been updated. The flaw, in the way Microsoft's software processes JPEG graphics, could allow a program to take control of a victim's computer when the user opens a JPEG file.