I am having trouble opening features on Vista which use MMC. For example, when opening Event viewer, I get an error message "MMC cannot open the file C:/windows/system32/eventvwr.msc" and is then followed by "This may be because the file does not exist,is not an MMC console or was created by a later version of MMC. This may also be because you do not have sufficient access rights to the file." Also, I cannot get in Network and Sharing centre - when I click on it, a window opens briefly and then closes. I have looked on the net and found other have had this problem, but I have not found the solution. I did once have the system working, so not sure what has changed. I have tried the sfc.exe and it found no errors. Can anyone help please???