After many failed attempts to update to WB5, I was finally able to get it installed last Saturday. Due to another problem with my anti virus software, I had to use a system restore point prior to the update and now I cannot get 5 to install. It gets to the final extraction at 99% and SDC completely vanishes from the screen. If I try to reboot, when Windows restarts SDC is running in the task manager and I have to manually kill the process before the system will boot completely. I have done this more than a half dozen times over the last few days with the same results. I have uninstalled and reinstalled the 4.6 so many times I am dizzy. Can someone help me resolve this issue?