I have Windows 7 professional sp1. I have been able to emulate (and recommend) the following emulators:
NES - JNES.EXE
SNES - SNES9X.exe
ATARI 2600 - STELLA.exe
ATARI 5200 - Atari++.exe (See post ATARI EMULATORS for settings)
ATARI ST - Steem SSE 3.3.0\Steem SSE 3.3.0.exe
ATARI 800 - Atari++.exe (Load the IMAGE *.atr / *.xex to play. I am using PS3 Joystick with Motionjoy emulator (deactivate Home - use Local). The "fire button" is the Triangle button).
NINTENDO 64 - Project64 2.3\Project64.exe
Playstation 2 - PCSX2 0.9.8\pcsx2-r4600.exe (Need fast machine)
Playstation 1 - Playstation 1 (Ken Castle)\KEN ePSXe.exe
SEGA (Genesis, Master System, CD, 32x) - Sega\Genesis\Fusion364\Fusion.exe
All of these WORK on my laptop computer in full screen mode! That's what I've found so far. I hope this helps those of you who are new to this (as I was a month ago).
Happy Gaming!