The below link is to download official Windows Vista Beta 2. You can use any download manager software such as FlashGet to download Windows Vista Beta 2 from the direct link. If you visit the link using your browser, it will prompt you to download an activex from Microsoft site and use their online Download Manager.
Do take note that the download is pretty unstable and I kept on getting disconnected and would have to retry download nearly every 5 minutes. Perhaps a lot of people already started to download the 4GB Windows Vista Beta 2 and Microsoft servers is not capable of handling too much download requests.
Windows Vista Beta 2 English x86 or x64
Direct Link:
• Windows Vista Beta 2, English 32-Bit Edition
• Windows Vista Beta 2, English 64-Bit Edition
Windows Vista Beta 2 German x86 or x64
Direct Link:
• Windows Vista Beta 2, 32-Bit-Edition (Deutsch)
• Windows Vista Beta 2, 64-Bit-Edition (Deutsch)
Windows Visata Beta 2 Japanese x86 or x64
Direct Link:
• Windows Vista Beta 2, Japanese 32-Bit Edition
• Windows Vista Beta 2, Japanese 64-Bit Edition
To get your own Windows Vista Beta key, see the instructions below.
1. Login to your Live account.
2. Browse to Microsoft Office 2007 ‘Get the Beta‘ Site
3. Select your Country and click Go

4. Check the URL after you pressed Go button. It should look something similar to the URL below.
https://profile.microsoft.com/RegSysProfileCenter/wizard.aspx?wizid=bc6972e5
-9969-40d5-85fd-2535f3f8d96f&lcid=17417&FU=https://www.microsoft.com/
betaexperience/scripts/office.aspx?lcid=17417%26Action=download%26Region=
APAC%26CountryCode=MYS
5. Ignore the first part of the URL which is https://profile.microsoft.com/RegSysProfileCenter/wizard.aspx?wizid=bc6972e5
-9969-40d5-85fd-2535f3f8d96f&lcid=17417&FU=
The important URL that you should take note is https://www.microsoft.com/betaexperience/scripts/office.aspx?lcid=17417%
26Action=download%26Region=APAC%26CountryCode=MYS
6. Copy the second part URL into your browser’s address and change office.aspx to vista.aspx
Example, https://www.microsoft.com/betaexperience/scripts/vista.aspx?
lcid=17417%26Action=download%26Region=APAC%26CountryCode=MYS
To change the country simply change the code at end of the URL, eg change ‘CountryCode=MYS’ to ‘CountryCode=USA’
7. It should forward you to the Windows Vista Site that has Windows Visa Beta 2 download links together with your Windows Vista Beta key.

8. You will also get an email from Microsoft that contains Windows Visa Beta 2 download links together with your Windows Vista Beta key.
Note: You can get 2 Keys, each one will activate 10 computers. After completing the download, you will need to burn the ISO file to a DVD.