You want to use both OSs?

• You want to use Linux, but still need access to MS Windows, just in case?

Dual-boot

• Install both MS Windows and Linux on same machine/disk:
  • ensure MS Windows is first on the disk — in both space and time.
• Access to only one OS at a time.

Virtualisation

• VMWare; VirtualBox
• Run two or more OS simultaneously — performance hit.
• Make sure you have plenty of RAM (at least 2GB, pref. 4GB).