Weight painting character

Hi there, I had a character that had a rig but it was pretty bad, so I got a volunteer job to have it rigged with inverse kinematics. But once everything was done, I didn’t really like the character, so I re-did a lot of things, and then the weight painting didn’t work anymore. The Inverse kinematics rig is still there, but the weight paint is all messed up. Could someone do it for me?