Can I Use Windows and Linux Together?Yes. You can "dual-boot," which means every time you turn on your computer (called "booting it up"), you will be asked whether you want to start Windows or Linux (or any other Operating Systems you may have).
You can also run Windows from inside Linux, using special software.
If you simply wish to get to your Windows files, that's easy, too. Many Linux programs can read and write standard Windows files.