So you get put-off and don't bother. You stick with Windows. You continue the cycle of grumbling about how slow your computer is, about how you have to install new antivirus updates every day.
Don't worry - now help is at hand with the new Switching from Windows guide. The guide is intended to help you plan and carry out a migration from Windows to Ubuntu, and should hopefully take you through all of the awkward bits step-by-step, including testing your hardware and transferring your data across.
So now there's no excuse. Switch now!