I was having trouble with my system failing to read disk formats, USB
flashdrives, and finally CDROMs, so I built a fresh Kernel from scratch,
getting the source from Kernel.Org and running menuconfig. But afterwards,
my Nvidia GeForce 9400 GT video drivers would not work. When I posted on
Nvidia,
Frankly, my advice would be to back up your data (use a Live CD if need be)
and do a clean install of a 32 bit ubuntu 9.10 (or whatever you like). The
restore your data. I would be surprised if there is any clean dependable
method to regress since you have little/no way to know what other 64 bit
