So what's out there on those Windows machines? Abobe's Flash Player and Acrobat lead the pack with 97% and 73% install rate respectively. Firefox is up next at 63%, handily trouncing competing browsers Internet Explorer at 20% and Chrome at 12%. WinRAR is the most popular archive utility, installed on 45% of the PCs. 7-Zip comes in a distant second at 18%. Adobe's AIR platform seems to have caught on well, with 41% of those reporting having it installed on their boxes. And, of course, there's BitTorrent clients, led by uTorrent, which showed up on 29% of the surveys.
You can check out the full results, along with all the usual stats in the Steam Hardware and Software Survey: July 2010.