The folding client has already been stopped on most machines and for those which try to obtain a new WU they to will be stopped at that time.
It will still propagate because it is in the wild on p2p networks such as Limewire and Bearshare, but it will not be able to fold if installed.
The person that raised the problem was folding just fine... he killed the FAHcore_78.exe process from within taskmgr, but not the client. If he did not see the process running, he would of submitted finished WU's.
I do hope after this is all said and done that everyone can get back to the project and have fun folding!!