Random Numbers from 0 to &HFFFFFFFF

Hi all

i want generate hex random values from 0 to &HFFFFFFFF

but it gives me error overflow 6

RandomNumberLong = CLng((Upperbound - Lowerbound + 1) * Rnd + Lowerbound)

what should i do to achieve this because i am getting overflow

are there any fix for this. or i should use GetTickCount.