To tell the type of keyboard, just look at the back of your PC. If where it plugs in is round and approx 1/4 " in diameter, that's PS/2. If it is a small little rectangle, that's USB. If it is round and 1/2" in diameter, that's serial.
more than likely since you have Windows ME, you have either PS/2 or USB. Serial was more for when Pentium just came out (1994 - Was one of the last years for this)
And I know you don't have 30GB of memory (maybe hard Drive Space) That would cost you over $10K for the memory alone.
To find out how much memory you have, Right click on the "My Computer" Icon on your desktop and then click on properties. At the bottom it will say ###,###,### KB RAM