As everyone kind of expected, Google Chrome, the world's leading browser with a comfortable market share of above 50%, is also the most installed software package.

This is one of several findings of a report from Czech security giant Avast, which aggregated anonymous usage data from a whopping of 116 million PCs.

According to Avast, second to Google Chrome in term of the number of active installs is Adobe's Reader app, followed by Flash Player (Active X version). The rest of the top 10 is made up by Firefox, the Flash Player Plugin, Skype, VLC Player, WinRAR, Java, and Adobe AIR.

Top 10 most installed software packages

The data from Avast's report was gathered via AVG TuneUp’s Automatic Software Updater feature, therefore, it also included details on the version number of each software package.

More than half of active software installs are out-of-date

On average, a user has around 49 applications installed on his computer, but Avast says that 52% of these are out-of-date.

The distinction of "least updated software" goes to Oracle's Java. Avast telemetry shows that around 56 million users run an out-of-date Java version, almost 50% of the entire install base, with half of this (25% of all Java installs) running the ancient Java 6 and 7 versions.

Second to Java is our old friend Flash Player, the Active X version deployed with Internet Explorer. Avast says that 99% of all Flash Player Active X installs are out of date. While not in the top 10, the Flash Player Plugin, distributed with other browsers, is also a serious offender, with 38% of all installs running non-current versions.

The rest of the top 10 most out-of-date software list is as follows. Just bare in mind the top 10 was classified based on the number of installs, not percentage of total install base.

#1 - Oracle Java - 50% of all installs run an out-of-date version
#2 - Flash Player (Active X) - 99% of all installs run an out-of-date version
#3 - FoxIT Reader - 92% of all installs run an out-of-date version
#4 - GOM Media Player - 90% of all installs run an out-of-date version
#5 - Nitro Pro PDF Reader - 89% of all installs run an out-of-date version
#6 - WinZip - 87% of all installs run an out-of-date version
#7 - DivX - 86% of all installs run an out-of-date version
#8 - Adobe Shockwave Player - 84% of all installs run an out-of-date version
#9 - 7-Zip - 82% of all installs run an out-of-date version
#10 - Mozilla Firefox - 73% of all installs run an out-of-date version

On the other side of the spectrum, the apps with the most up-to-date versions are typically those that prominently feature built-in mechanisms:

#1 - Google Chrome - 88% of all installs run the latest version
#2 - Opera - 84% of all installs run the latest version
#3 - Skype - 76% of all installs run the latest version

Most up to date software packages

For more details and statistics, check out Avast's PC Trends Report.