openssi and debian etch preferences

Hello all :)

I want to do a HA- Cluster with openssi on vmware with debian etch. I tried 
openssi stable and development but running in a kernel panic. I did also a 
mkinitrd -o.
I think it has something to do with downgrading the packages, cause when I 
use /etc/apt/preferences Then I get a warning If I sure to delete the 
packages and I have to write: "yes, I know what I do" So I dont do it.
What Prefences can I use?
can someone help?

tia 
stefan

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