[Ted S]

Not much risk in the delete process... I assure you (especially if you don't mind doing a complete reset).

Here's a few queries you could run:

To remove all votes:

DELETE FROM helpfulpost;
DELETE FROM helpfulanswer;

To remove votes from one user:

DELETE FROM helpfulpost WHERE userid = XYZ;
DELETE FROM helpfulanswer WHERE userid = XYZ;

Pretty simple.