AppleWin is a freeware Apple //e emulator for Windows which emulates an enhanced Apple //e with 128k RAM, two disk drives, a joystick and a serial card. It supports all //e video modes, including double high-res, and emulates either a color or monochrome monitor. It also features adjustable system speed control.
It has worked beautifully for me on Windows XP, and so far every game I've tried has been successful. Using AppleWin is easy; simply click on Drive 1 or Drive 2 to open a disk image from your computer and then click the Apple logo button to begin emulation.