You need to use the Randomize statement as shown in post #2.

If you want different numbers each time, call Randomize just once at the start of your program (eg: in Form_Load).

If you want to be able to repeat the same set of numbers, call Rnd with a negative argument first, and then Randomize with whatever number you want, eg:
Code:
Rnd -1
Randomize 2345