Remember Vista requires all PC with TPM.
From
http://www.wavxdd.com/reports/GTR_February_2007_web.pdf
Page 8 ( if you never heard of George Gilder, try Google search)
"No one now excatly competes with Wave Systems in supplying implementation software that works across all the hardware embodiments of TPMs from Infineon, Atmel, and STMicroelectronics, which cover almost 100 percent of the PCs with TPMs.
WAVX!
