What is the question?
If you ARE rooted you need to install a file manager (Ex. Root Explorer), set R/W and either delete or Rename the file. Suggest you simply rename by adding a .bak to the end of it.
Once this is complete flash the recovery image through fastboot.
BTW .. you could have posted this in the Clockwork thread and the instructions I gave above are already there.
Edit: LOL ... I must type too slow. In 7 minutes you got three identical answers.