[Darkwaltz4]

you can manually edit anyone's points in the user manager in the ACP

you can also set everyone to 0 by using the tool at the bottom of the update counters screen. Just select all usergroups but dont select any award types, then make sure "Add credits to existing totals instead of starting over?" is on No. This effectively sets everyone to 0 :-p

Of course, selecting the types will reset everyone to what they should be, regardless of donations, purchases, spending, etc. (I recommend this be run once the usergroup settings are decided and you have just finished installing.)