Windows预先安装环境（Microsoft Windows Preinstallation Environment，简称Windows PE或WinPE）是简化版的Windows XP、Windows Server 2003、Windows Vista、Windows 7、Windows 8、Windows 8.1。WinPE是以光盘或其他可携设备作媒介。WinPE作用是方便大企业作出工作站和服务器的企划、给「原始设备制造商」（OEM）制造自订的Windows操作系统、取代MS-DOS的磁片。Windows PE可理解为Windows的LiveCD。

Windows Preinstallation Environment (also known as Windows PE and WinPE) is a lightweight version of Windows used for the deployment of PCs, workstations, and servers, or troubleshooting an operating system while it is offline. It is intended to replace MS-DOS boot disks and can be booted via USB flash drive, PXE, iPXE, CD-ROM, or hard disk. Traditionally used by large corporations and OEMs (to preinstall Windows client operating systems on PCs during manufacturing), it is now widely available free of charge via the Windows Automated Installation Kit (WAIK).