Erm! Iif you dont have a micro SD card installed, then it sounds like the error from the "dpkg -i /home/user/MyDocs/nitdroid-kernel-2.6.28-07_rc4_armel.deb" has caused bits to be miissed out. You could try the Code: dpkg -i /home/user/MyDocs/nitdroid-kernel-2.6.28-07_rc4_armel.deb again. Youll probably have to edit the file with leafpad again as per step 4. Problem is you may just get the same error as last time! You sure you did everything as root? Did the tar command produce any errors?
dpkg -i /home/user/MyDocs/nitdroid-kernel-2.6.28-07_rc4_armel.deb