Does it have a restore partition on it? What version of windows on it?
Just got a refurbished IBM Lenovo desktop that came with Chrome browser, latest version. I configured it as the default browser. But every time I open it, it asks me if I want it to be the default browser. I click yes and to remember it. But the next time I open it I get the same message. I have gone through settings and set it as the default browser. In other words, it forgets. And I have the same problem with MS Outlook.