Well, I just got my new computer, a Lenovo/IBM Thinkpad X61 with the daylight touchscreen. It has a Centrino Pro Core Duo processor. Thanks to Dave Kralls girlfriend Robbie, I own a copy of Vista Ultimate and Office Ultimate. When I went to upgrade the Vista, it comes with 2 disks, a 32 bit and a 64 bit. When I put in the 64 bit, it wouldn't upgrade and told me I should boot from the CD for the 64 bit. So therein lies my question. What does the 64 bit do for me the 32 doesn't. It is my (perhaps eroneous) impression that the core duo processor supports true multi tasking allowing back ground programs to operate on one processor, and the active program to operate on the other. So, I'm suspecting that it's the 32 bit software that supports this. Am I incorrect on this?