Missing Groups

First I will state that this happened after msblast incident which my company we heavily infected by on mostly laptops. We had to manually remove the virus for the most part but we also were able to use the fixblast application supplied by Norton. Then we applied the KB823980 patch.

Now we are seeing a lot of quirkiness in the laptops, most vexing is that on some of the machines we’ve noticed that the local groups are missing, try to recreate them and it will say that they exist already. We also seen where we try to add a user to a group and it will state that the user is already part of the group such as administrator but does not get admin rights nor can the name be found.

Has anyone else seen this or no of a solution?