There are many websites where you can read what "32 bit", "3.5GB RAM" etc. means. When you're going to develop games, you need some basic PC knowledge. Otherwise you will be always hampered by similar problems. Confused rants won't help you.

Your problem to store a file has nothing to do with "RAM". It is difficult to tell the reason from afar, but maybe you've set the file accidentally to R/O, or it is indeed an admin problem. For projects on your PC, you normally should use the Documents folder, not the program files folder. Alternatively you can switch off the UAC. When you do a search for "UAC" on this forum you'll find instructions.

In any case, with some PC knowledge you won't be helpless in such a situation. You then only need to ask for help when the obvious steps don't solve it and the problem remains a mystery.