AVG

AVG Internet Security 2011, which shipped on Tuesday, offers the full complement of tools you'd expect in an all-in-one security suite, packaged in a simple-to-use interface and offering integration with popular browsers and Outlook. But the software is marred by annoying attempts to upsell you to other products, and a scanning engine that may slow down your system.

For the longest time, AVG deserved to be one of the most popular anti-viral programs around. That's no longer the case.

A flawed signature update to AVG Technologies' antivirus software over the weekend crippled some Windows XP PCs by mistakenly deleting a critical system file.