Hi, I have had the same experience two times. The first time I found out that WinOnCD 9 started the installer. So I deinstalled this program and reinstalled it. After this the error disappeared. The second time there has been probably a connedtion with Speed Startup. Maybe I deactivated a process needed for some function. So I deinstalled Speed Startup and reinstalled it. The error did not happen again. Since this I always deinstall Speed Startup before installing a new program.
Result: there is always a conflict between something new on the computer and something old. But I don't know if this will help you. rawana75