Hi
If you Google search "randomize random" you get 977,00 hits
and a random selection indicate this can be done by use of the computer timer to provide a "seed". Many of these hits apply to languages other than basic.
"randomize random basic" gives a more focused 244,000 hits which use the same technique.
A very simple technique might be to use %TIME%, which appends ".nn% as a decimal fraction of a second, and if you extract these last two digits you will automatically have a "random" number in the range 00 to 99 - which may be close enough to your original requirement of a range 0 to 100.
Regards
Alan