I need KDZ HELP pls - Must re-flash. Damaged rom/os

Friends I need help lest I totally nuke my Optimus

Forgive me in advance for multiple posts but I got no responses elsewhere so trying again. My phone was bricked yesterday but with repeated tries at rebooting, it miraculously got partly back to life. It is currently running, but has damage due to me incorrectly using Root Uninstaller App. A bunch of things don't work right, starting with the home button so I don't know how to navigate around. BUT, what I must do is reflash with the latest update and start again.
I'm not concerned about losing apps etc - I am mainly in "learn mode"

I have the KDZ Updater, but when I tried to use it I got "phone not found".
The phone is alive in Windows 7 - drivers installed, and in USB mode - I can browse all the folders.

I read somewhere that "following the KDZ instructions will brick the phone"... that's a pretty alarming statement so I cannot merely experiment.
I need someone with knowledge and experience using KDZ updater, or an accurate set of instructions - real-world. I have the rom file, the updater, and the parser [I guess that's what it is] and just need tutoring.

thanks for the help!

 

thx for writing - i solved it a week ago. in my case, the rom was present, but damaged, so the 'auto' way is of no use.
finally found a good/verified/non-buggy 'L' version and pushed it with the kdz updater. worked. all good.

time to hack some more