http://download.windowsvista.com/preview/prerc1/en/download.html
yep im downloading already
This pre-RC1 build is available for a limited time – we will close the program when we reach 100,000 downloads.
After downloading, please install and test the build as soon as possible. Most importantly, if there is a crash, hang, or error – please make sure that you send the information back to us using the built-in Windows Error Reporting technology (a dialog box will display automatically). Sending this information is essential to helping us improve the overall quality of Windows Vista – and collecting this information is the primary purpose of distributing this pre-RC1 release.
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yep im downloading already