I wiped XP & loaded kde-minime-2011.09 on a friends computer with a Sempron CPU and then upgraded the kernel to 2.6.38.8.bfs and now he says the machine locks up quite frequently.

He's pretty sure it didn't do this before I "improved it".

He's 23 miles one way therefore field service gets to be a bit of a drag and so I explained that the old kernel should still be available at the boot screen if he's quick enough (5sec).

My question is what was the default kernel version in kde-minime-2011.09 and is there a better match for an AMD Sempron CPU?
Thanks!