I have spss 14.0. I'm trying to install and get an error saying make sure it's a valid windows installer. I then tried to install as an administrator on my computer it said i could not install as well. maybe the disk is messed up? also i called 24/7 tech support online and they said because i've tried the spss trial versions 16.0, 15.0 then they are blocking me from installing. is that true??