Amiga Forever & C64 Forever emulators are on special for the US "Cyber Monday" shopping event. Normally $29.95 and $14.95 each — available together under this deal for $9.95.
They are freeware emulators (with a lot of custom development on top) packaged up with legally licensed system ROMs as well as hundreds of games originally available for those systems and ready for simple installation on Windows - none of the normal configuration required. They're Windows 7 compliant.
More info on both…
Amiga Forever - http://www.amigaforever.com/
C64 Forever - http://www.c64forever.com/screenshots/
You can also download practically every game released for these platforms from various abandonware sites (legality a little grey of course, unlike the games that actually come as part of this bundle.)
It appears that the "Amiga Forever" software can be copied to a bootable ISO DVD which doesn't require a Windows Host OS. This would be helpful for Apple Mac or Linux users that are interested in this software.
It is unclear whether "C64 Forever" offers this capability too.