I found an original iMac with Os X surprisingly on it at a recycling plant. How do i open things like microsoft on it with a cd or usb? i accepts some cds that have music but not others.
also, how do i load an old version of windows onto it so that i can access mac and windows
thanks

Windows 7 requires Mac OS X v10.7 Lion or Mac OS X v10.6 Snow Leopard and the Boot Camp 3.1 Update

System requirements for Windows 7

To use Boot Camp with Windows 7, you will need the following.

For Mac OS X v10.7 Lion systems:

* An Intel-based Mac that supports Mac OS X v10.7 Lion.
* A blank CD or USB storage device to create Windows 7 Boot Camp Support Software (drivers) installer media. You can also create media that contains an ISO image of Windows 7 and the drivers.
* At least 16 GB of free space on the disk onto which you’re installing for 32-bit, or 20 GB for 64-bit (for Microsoft Windows and Windows-based applications).

If you are installing using Windows 7 DVDs, you will need one of the following Microsoft Windows discs:

* An authentic, 32-bit Microsoft Windows 7 Home Premium, Professional, or Ultimate disc.
* With some Macs you can use an authentic, 64-bit Microsoft Windows 7 Home Premium, Professional, or Ultimate disc.

See http://manuals.info.apple.com/en_US/boot_camp_install-setup_10.7.pdf for step-by-step instructions.