1. Knoppix 6.01 works ok on my Dell D610.
2. Only point is the 'persistent feature', I have not got it to work (me probably!).
3. turned off 'Compiz" (?) I tend to use only one desktop

Many thanks to Klaus for his very good work.
PS I use Knoppix 3 , 4 and 5 as well on older different machines back to single pentium.
I have used Knoppix 4 to rescue other persons windows machines so I have a great deal of well placed trust in Klaus.