After install: wrong database root path in my.ini file (2 replies)

I am a newbie and just installed 5.1.51 on win 7 64 bit.
I was checking for my data folder (I think this store all the files when a datbase or table are created). My concern is, I cannot locate the data folder in my installed directory- it does not exist. Therefore I open my.ini file and found that the path for this is:

#Path to the database root
datadir="C:/ProgramData/MySQL/MySQL Server 5.1/Data/"

But, C:/ProgramData does not existing on my computer.
I tried to modified the path but its a read only file.

Any explanation on what is happening and what should I do to fix this?

Thank you in advance