AMD strictly moderated (AMD)

[mmoy]

Many here laughed at my insistence on buying only 64-bit processors to avoid missing out on future technology and winding up with a
computer with a premature end-of-life. Well, here's a good reason
to have bought 64 bit processors over 32 bit processors.

"Pity the Vista user with a 32-bit CPU. Senior Program Manager Steve Riley announced today at Tech.Ed Australia that full HD content shall only be played at the full resolution where only signed drivers are used — only in the 64-bit version of Vista. From the article: '"Any next-generation high definition content will not play in x32 at all," said Riley. "This is a decision that the Media Player folks made because there are just too many ways right now for unsigned kernel mode code [to compromise content protection]. The media companies asked us to do this and said they don't want any of their high definition content to play in x32 at all, because of all of the unsigned malware that runs in kernel mode can get around content protection, so we had to do this."'"

(from SlashDot)