Vista - ECS KN1 with Radeon 1600 Pro installtion failure

I have now tried several builds of Vista including the 5744 (?) as the latest
on my ECS KN1, AMD 4400+ with ATI RAdeon 1600 graphics card. I get thru the
file copy phase but when the system does the first reboot I get a blue screen
at the point when it switches from the initial boot screen to something else.
The codes usually found are kernel mode exception or IRQ.... or NTFS... The
same code does not appear twice in a row.
When I use F8 and select the low resolution option I get one step further to
the point where Vista switches from the boot screen to the first greenish
Vista screen, but then crashes again (BSD).
BTW the upgrade advisor says I could install Vista ! :-)

Elite Group folks say that the problem is/maybe the driver for the graphic
card. How can I prevent this happeneing? Is this true? Anybody out there
using a KN1 board.
Thanks for all hints
regards
Thomas