听下面一段独白，请根据题目要求，从所听到的内容中获取必要的信息，填入空格中。

Google, the Internet search , will now offer a free operating system for personal computers. The hopes to loosen Microsoft's hold on the market. Microsoft Windows is on more than percent of PCs. Google is basing the new on its Chrome Web browser and the Linux open-source operating system. The Google Chrome OS is expected to be available .