Storing a password

I'm writing a program that is supposed to be used for educational purposes on high school/college level, and I want to password-protect some features so that only the teacher can access them.
Now, the problem is how to save this teacher password. I guess I will have to encrypt it and write it to file when the program exits, but how do I prevent people from simply deleting this file, thus resetting the password? I could always set the filename to something strange and put it in a hard-to-find location, but this seems like a lame way of doing it.
Thoughts on how do to this? I don't need extreme security as I don't expect anyone to put that much effort on breaking the password. I just need something that is secure enough not to be cracked during a lesson.

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I guess I will have to encrypt it

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read http://www.cprogramming.com/tutorial/xor.html

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Thoughts on how do to this?

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Making it hidden would help add a little bit of protection. You could use the trick spyware people do using a dll and the registry which would probably keep it as safe as you need.

Use the registry. Store the password somewhere in the computer's registry, encrypted, and with a name that doesn't directly relate to your program. This will be virtually impossible to find/alter/delete unless someone uses a registry sniffing program. In the case that the password does get erased/deleted, you can just check that and make it so you can't log in at all.

Using the registry sounds like a good idea. Thanks alot!