Windows only: Free application Secunia Personal Software Inspector is a great way to keep your software up-to-date and secure, but now you can scan your PC for the most common security problems from any web browser—no install required.
Once you head to the online scanner page, you can simply start the scan by choosing whether to do a thorough inspection, and then clicking the Start button. You'll be presented with a list of insecure applications on your PC so you can make sure to patch them. The only requirement is having Java enabled in your browser, and the scan should work for any version of Windows.
The online scanner doesn't cover every application on your PC, and only checks for the most common programs and vulnerabilities—Adobe Reader, Flash, QuickTime, Java and other common sources of security holes that lead to drive-by browser malware attacks. If you want to scan every application on your PC, we've already covered the freeware installable version of Secunia when we told you to stop paying for Windows security, but if having another application installed is a problem, having access to an online scanner instead is a great feature that will help you keep your PC safe.
Secunia Online Software Inspector is free for anybody to use, works in any Windows web browser that supports Java.