If you use the ever-popular WinZip application then it's probably a good time to update your software to latest version, WinZip 9.0 SR1. At least two unchecked buffer vulnerabilities exist in previous versions that could lead to the execution of arbirary code on your systems. You can read a little more about those vulnerabilities at Secunia's Web site. WinZip Computing has released an update, 9.0 SR1, which upgrades all previous versions to the latest fixed version.