New to I.T .. help please

Hi everyone,

I just changed my major to IT and im studying for my exam..

can any1 please help me understand any of the following..

1- what are RISC - CISC - FLOPS?
and whats the difference between RISC and CISC computers??

2- machine language reference are in what level ??

3- what are translator, interpreter and virtual machine??

4- the difference machine was of what generation of computers?

thanks alot folks!