Windows 7 is part of the Microsoft Windows family. Previously, there was a limit to download only 2.5 Million copies but this limit has been lifted up to any limit until 24 January, 2009. Checkout at the Windows 7 Blog.

Minimum recommended specs call for:
1 GHz 32-bit or 64-bit processor
1 GB of system memory
16 GB of available disk space
Support for DirectX 9 graphics with 128 MB memory (to enable the Aero theme)
DVD-R/W Drive
Internet access (to download the Beta and get updates)


Download the Windows 7 Beta here from Microsoft :
ISO for Windows 7 Beta 32-bit (English)
ISO for Windows 7 Beta 64-bit (English)
download it here

For bug problem, you can download the KB961367 update to fix MP3 corruption bug.
Here are the bug fix download links for 32 Bit and 64 Bit.
Download Fix (32-bit)
Download Fix (64-bit)

To learn more about the Windows 7 Beta, see Frequently Asked Questions.
Tutorial on how to install Windows 7.