Sophos unveiled free antivirus software today that Macintosh users can install to detect and block malware that targets computers running the Mac operating system. Sophos Anti-Virus Home Edition for Mac also detects malware written for Windows that Mac users can spread via USB drives and e-mail
Runscanner is a completely free windows system utility which scans your system for all configured running programs. You can use runscanner to detect autostart programs, spyware, adware, homepage hijackers, unverified drivers and other problems.