Looks like you tried using the insecure kernel that was the first rooting technique (XWKDD). Chances are your phone is running XWKE7 as the firmware, so leaving the old kernel should work, but its not 'on par' with the rest of your system.
Personally, I ran a more recent rooting kernel, as it comes with some built in backup utils. I would recommend using this one, as you don't need to bother with superoneclick or anything anymore... Same guy who released the original insecure kernel.
Fairly easy to follow instructions.
If you don't like the yellow triangle on boot, there's instructions on the second post. Just make sure you follow very, very closely and you'll need the XWKE7 stock kernel from
here, password for the zip is intratech@XDA (as seen in
this thread)
Hope this helps! You should be able to follow the instructions from where your phone is at the moment.