I have just tried for ages to install NOD32 on recomendation to replace all virus/spyware used before (had system-draining issues and compter hanging a lot etc. & been told NOD32 is v good) Never had this error message before when trying to install ANY progam? Am fairly pc literate & tried some fixes like turning off user account control etc. but all to no avail. e.g. methods here (& in attached link from that page too - 2nd link below) -http://systemadministratorhassetpoliciestopreventthisinstallation.com/ http://www.vistax64.com/tutorials/80938-user-account-control-uac-elevate-privilege-level.html Can anyone help me. I am operating Vista Home Premium and as I said, never had this before/don't understand why it is only this program I cannot install?!