How to install a Debian (Sarge) kernel 2.6?

[ZePhilou <philippe.musial@worldonline.fr>]

Hello,

Please just let me know where there is a documentation (or how) to 
*install* (not  to build) a debian kernel 2.6: I tried aptitude install 
kernel-image-2.6.8-2-k7 and I also installed module-init-tools but with 
these packages I can't reboot my computer, it stops after the message 
"decompressing linux kernel..." I saw that I had to do something with 
/sys but I didn't find something about it related to Debian.

Thanks for your help
Greetings

Philippe