The upgrade cycle begins, with Microsoft's latest operating system--the highly anticipated Windows 10--rolling out over Windows Update for free, for users of 7, 8 and 8.1. For those that are ready to take the plunge over the weekend, there are some things to note. While this guide is by no means exhaustive, there are some useful reminders here as well as some potential pitfalls that may rear their ugly head during the upgrade process.

So far, Microsoft has been rolling out the upgrade in waves and stages. If you are not one of the 'lucky? ones to be in the first wave, you can take matters into your own hands and begin the upgrade process manually. While the process is mostly simple, it won't be for everyone...