Default [Q] Unable to Access Recovery Mode

Hi everyone. I'm new to this forum and this is my first time trying to install a custom ROM.

I followed the advice from another post (I can't link it apparently) and I got everything to work initially on my Samsung Galaxy Nexus.

Then, upon rebooting, I could not access Recovery mode. I searched a bit more on the web and then tried to delete the /system/recovery-from-boot.p and another system file. Even though both were in R/W mode, they could not be deleted. Every time I try to flash from ROM Manager, I get an error.

I'm not sure what to do at this point. Please help!